Question

z= 5x -15
z=15x- 5
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Answer 1

z=5x-15
z=15x-5

5X-15=15X-5
5X-15X-15=5
5X-15X=-5+15
-10X=-5+15
-10X=10
X=-1

z=15X (-1)-5
Z=-15-5
Z=-20

V={(-1,-20)}

Answer 2

z = 5x - 15

z = 15x - 5

5x - 15 = 15x - 5

15x - 5x = -15 + 5

10x = - 10

x = - 10/10

x = -1

z = 5x - 15

z = 5*(-1) - 15

z = -5 - 15

z = - 20