The graphs of $y = x^2 - 7x + 7$ and the line $y = -3$ intersect at two points. What is the sum of the $x$-coordinates of these two points?
Put in y = -3 into the first equation to get :
-3 = x^2 -7x+ 7 then
x^2 -7x + 10 = 0 now you can factor to find 'x' values or use the Quadrtatic Formula
(x-5)(x-2) = 0 shows 'x' values of 5 and 2 the sum would then be 7