What is the system subtitution of 2y=x+1 ; -2x-y=7

Solve for x in 2y = x + 1

x = 2y - 1

Substitute x = 2y - 1 into -2x - y = 7

-5y + 2 = 7

Solve for y in -5y + 2 = 7

y = -1

Substitute y = -1 into x = 2y - 1

x = -3

Therefore,

x = -3

y = -1

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step-by-step explanation:

e

step-by-step explanation:

an equation by definition has to have two or more variables (x and 2 in this case)