Word problems relating 3 variable systems of equations

Word problems relating 3 variable systems of equations

Lessons

  • 1.
    Quadratic Equation Problem

    Find the equation of the parabola, y=ax2+bx+cy = ax^{2} + bx + c, that passes through (-2, -10), (1, -4), (3, 30).


  • 2.
    Number Problem

    The sum of the digits of a three-digit number is 16. The units digit is 2 more than the sum of the other two digits, and the tens digit is 5 more than the hundreds digit. What is the number?


  • 3.
    Geometry Problem

    The measure of the largest angle of a triangle is 30° less than the sum of the measures of the other two angles and 9° less than 2 times the measure of the smallest angle. Find the measures of the three angles of the triangle.


  • 4.
    Investment Problem

    Thomas has $6000 invested among a checking account paying 2% annual interest, a savings account paying 5% annual interest, and a bond paying 7% annual interest. He earns a total of $355 in annual interest and he has $2300 less invested in his savings account than in her bond. How much has he invested in each account?