Which equation shows the substitution method being used to solve the system of linear equations?

x – y = 7
x = y + 3

A.
x – (y + 3) = 7

B.
(y + 3) – y = 7

C.
x – y = y + 3

D.
x = (7 – x) + 3

Question

Which equation shows the substitution method being used to solve the system of linear equations? 
 
x – y = 7 
x = y + 3
 
 A.
x – (y + 3) = 7
 
 B.
(y + 3) – y = 7
 
 C.
x – y = y + 3
 
 D.
x = (7 – x) + 3

nnesha · Answer

for substitution method you have to solve one of equation for one variable
the equation you have there is already 2nd equation solved for x 
so replace x which is in first equation by their values

nnesha · Answer

|dw:1420439574905:dw|
replace x
and let me know what you get