Answer:
(1) y = -50, if x = 7
(2) y = -1, if x = 14
(3) y = 66, if x = 6
(4) y = 13, if x = -10
(5) y = -57, if x = -13
Explanation:
For these problems, the questioner simply wishes you to plug in the value of x for each of the given equations. Once you evaluate the equations at the given values of x, you will have solved for y. Let's work these out step by step.
(1) y = -9x + 13, if x = 7
(1) y = -9(7) + 13
(1) y = -63 + 13
(1) y = -50
(2) y = (1/2)x - 8 , if x = 14
(2) y = (1/2)(14) - 8
(2) y = 7 - 8
(2) y = -1
(3) y = 15x - 24, if x = 6
(3) y = 15(6) - 24
(3) y = 90 - 24
(3) y = 66
(4) y = -0.8x + 5, if x = -10
(4) y = -0.8(-10) + 5
(4) y = 8 + 5
(4) y = 13
(5) y = 3x - 18, if x = -13
(5) y = 3(-13) - 18
(5) y = -39 - 18
(5) y = -57
Hope this helps.
Cheers.