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

x – y = 7
x = y + 3

A.
x – y = y + 3

B.
(y + 3) – y = 7

C.
x – (y + 3) = 7

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 = y + 3
 
 B.
(y + 3) – y = 7
 
 C.
x – (y + 3) = 7
 
 D.
x = (7 – x) + 3

anonymous · Answer

sub x =y+3
into x-y=7
(y+3)-y=7

igreen · Answer

Substitute y + 3 for x in the first equation:

x - y = 7

Replace x with y + 3, what do you get? @fangs

anonymous · Answer

thank you for the help

igreen · Answer

Welcome to Open Study!

You can give medals by clicking 'Best Response'. @fangs

igreen · Answer

@Let.Van Don't give out answers.

anonymous · Answer

is a direct substitution...The best way to learn it is to see as many of these as possible