Vanessa will graph the lines y=(1/3)x + 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.
The x intercept of a graph is the point where y=0 so the point is (x,0)
To find the x intercept of a line, set y to 0 and solve for x.
multiply by 3
so the x intercept is (-21,0)
divide by 2
and the x intercept is (-2.5,0)
Add the x intercepts together: