Question

Is the point (9,-9) a solutionto the linear equation
-2x-y=-9

Answer 1

Short answer: yes.

Substituting for x and y, you have

... -2(9) - (-9) = -9

... -18 + 9 = -9 . . . .eliminate parentheses

... -9 = -9 . . . . . . . .a true statement