7. Solve 2x - y = 7 for y. Then find the value of y when x = - 1,0, and 1.

Step-by-step explanation:

We want to solve 2x - y = 7 for y. Start by changing the signs of all terms, obtaining - 2x + y = - 7. Now add 2x to both sides, obtaining y = 2x - 7.

Now evaluate this at x = - 1: y (-1) = 2 (-1) - 7 = - 2 - 7 = - 9

Now evaluate this at x = 0: y (0) = 2 (0) - 7 = 0 - 7 = - 7

Now evaluate this at x = 1: y (1) = 2 (1) - 7 = 2 - 7 = - 5