Question

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



x – y = 7

x = y + 3



A.


(y + 3) – y = 7


B.


x – y = y + 3


C.


x = (7 – x) + 3


D.


x – (y + 3) = 7

Answer 1

We can substitute y + 3 into the first equation for x.

\(x - 7 = 3\)

Substitute y + 3:

\((y + 3) - 7 = 3\)

So what's your answer gonna be? @iQueen

Answer 2

x - y = 7
x = y + 3......so if we know that x = y + 3, then sub in y + 3 in for x in the first equation

(y + 3) - y = 7
any questions ?