jmc

Question

Vanessa will graph the lines y = 13x + 7 and y = 2x+5. What is the sum of the x-coordinates of the two lines' x-intercepts? Express your answer as a decimal to the nearest tenth.

Accepted Answer

The x-intercept occurs where y=0. For the first equation, setting 0 = 13 x + 7 yields x = -21. For the second equation, setting 0 = 2x + 5 yields x = -2.5. Adding these together, our answer is -21 + -2.5 = -23.5.