Question

PLEASE SHOW WORK
Solve using substitution
y=x+4
x-y=-4

Answer 1

x= -8 y= -4

Explanation:

SOLVING FOR X

y=x+4

x-y=-4

----------------------

x-x+4= -4

-4 -4

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x-x= -8

x= -8

SOLVING FOR Y

plug in the x in any equation

y=(-8)+4

y= -8+4

y= -4

Answer 2

y = x + 4 (*)

x - y = -4 (**)

Substitute (*) to (**):

x - (x + 4) = - 4

x - x - 4 = - 4

- 4 = - 4 TRUE

Answer: Infinitely many solutions.

x ∈ R

y = x + 4