Question

Solve the following system of equations by using the substitution method.
x – y = 3
2x + 2y = 2
Answer

(3, 4)

(-4, 5)

(2, -1)

Inconsistent

Answer 1

the answer is (2,-1)

Answer 2

we have a system !:
So look :
-2x+2y=-6
2x+2y=2
(we had *-2 caz want to kill x s with sum the equations !)
so now sum :
have :
4y = -4
y = -1
and x :
x-y=3
X+1=3
So x is 2 and have :
(2 , -1 )

Answer 3

Got it ?!:)

Answer 4

if x=3-y..........(1) by using substitution let 2x+2y=2.........(2) putting (1) in (2) you have 2(3+y)+2y=2 where y=-1 then substituting y back in (1) you have x=2

Answer 5

@nelotsak @E.ali Thank you both I was trying to solve a different problem while waiting for someone to help . . . .Thank you both again for the help (: and your well explanations