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How to read graphs of linear relationships

8.EE.A.1

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Using exponents to describe numbers

Expanded powers

Exponent rules

Single Power Expressions

Dividing powers

Multiplying powers

Order of operations with exponents

Product rule of exponents

Quotient rule of exponents

Power of a product rule

Power of a quotient rule

Power of a power rule

Simplify the power

8.EE.A.2

Squares and square roots

Square Root of a Perfect Square

Square and square roots

Cubic and cube roots

Cube root of a perfect cube

Converting radicals to mixed radicals

Converting radicals to entire radicals

8.EE.A.3

Scientific notation

8.EE.B.5

Parallel and perpendicular lines in linear functions

Understanding graphs of linear relationships

Linear relations

Understanding tables of values of linear relationships

Linear relation

Applications of linear relationships

Identifying proportional relationships

8.EE.B.6

Slope equation: $m = \frac{y_2-y_1}{x_2- x_1}$

Slope equation: <katex>m = \frac{y_2-y_1}{x_2- x_1}</katex>

Slope intercept form:  y = mx + b

Slope intercept form: y = mx + b

8.EE.C.7

Introduction to linear equations

Model and solve one-step linear equations: ax = b, x/a = b

One-step Linear Equations

One Step Linear Equations — Word Problem

One-step equations

One-step Equations LHS

One-step Equations RHS

Model And Solve One Step Linear Equations Divide – Word Problem

Model And Solve One Step Linear Equations Multiply – Word Problem

Solving two-step linear equations using addition and subtraction: ax + b = c

Two-step Linear Equations

Two-step Linear Equations LHS

Solve Linear Equations Using Addition and Subtraction – Word Problem

Two-step Linear Equations — Word Problem

Solving two-step linear equations using multiplication and division: x/a + b = c

Two-step Linear Equations RHS

Solving two-step linear equations using distributive property: a(x + b) = c

Solve Linear Equations Using Distributive Property – Word Problem

Solving literal equations

8.EE.C.8

Determining number of solutions to linear equations

Solving systems of linear equations by graphing

Solving systems of linear equations by elimination

Solving systems of linear equations by substitution

8.F.A.1

Relationship between two variables

Identifying functions

8.F.A.2

Function notation

8.F.B.4

Applications of linear relations

8.F.B.5

Graphing linear functions using table of values

8.G.A.1

Line symmetry

Tessellations using translations and reflections

tessellations using translations and reflections

8.G.A.2

Rotational symmetry and transformations

8.G.A.3

Enlargements and reductions with scale factors

Tessellations using rotations

8.G.A.4

Similar polygons

8.G.A.5

Similar triangles

8.G.B.6

Pythagorean theorem

Pythagorean Theorem

8.G.B.7

Using the pythagorean relationship

8.G.B.8

Distance formula: $d = \sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

Distance formula: <katex>d = \sqrt{(x_2-x_1)^2+(y_2-y_1)^2}</katex>

Distance formula

Applications of pythagorean theorem

8.G.C.9

Volume of cylinders

Word problems relating volume of prisms and cylinders

Surface area and volume of cones

Surface area and volume of spheres

8.NS.A.1

Understanding the number systems

Rational vs. Irrational numbers

8.NS.A.2

Determine square roots of rational numbers

Square roots of rational numbers

Estimating square roots

Converting repeating decimals to fractions

8.SP.A.1

Reading linear relation graphs

Box-and-whisker plots and scatter plots

8.SP.A.2

Solving linear equations by graphing

8th Grade Math

math

Ex. 1:

Ex. 2:

<p>- Hi, welcome to this question right here. So we've got a little graph right here trying to show you some kind of relationship. So what we have here is the cost of the chocolate bars, okay? So we've got the y-axis and the x-axis here. So remember the x-axis is your independent variables. Here we have the number of the chocolate bars, okay? So we've got one all the way up to 10. Over here, on the y-axis, you've got the cost of the chocolate bars. So if you see, here it is, there's a one, two, three, four, five, six, seven dots. These dots are telling you the number of chocolates and their price according to the number of chocolates you're buying. So let's say, for example, if you have one chocolate bar right here, let me fill the table right here for you. You've got one chocolate bar it's gonna cost you $2, okay? Now, if you're buying two it's gonna cost you $4, okay? And if you buy three it's gonna cost you $6, okay? So. . .<br />
and so on until you get the 6 chocolate bars, it's gonna cost you $12. So what's the relationship or the pattern that's represented by this graph right here?<br />
Well, the pattern is that for every chocolate bar that you bought, it's a $2 increase, okay, and you probably got that already just by looking at the first one. Every chocolate bar is $2, okay? So every time you increase your chocolate bar by one, of course, over here you'll increase by two, okay? So that's the pattern. Basically, every chocolate bar is gonna cost you $2, okay? Thanks for watching.</p>


Without understanding and analyzing, graphs of linear relationships are just lines and dots. In this lesson, we will learn the skills to analyze the graphs and get useful information from them.

Understanding graphs of proportional relationships 

Ratios

Proportions