How to slove by using the substituion method?

2x+2y=0,
so x= -y

Substitute "x = -y" into " - 4x+y = 35"
You get 4y + y = 35,
So 5y = 35, and y = 7.

Substitute "y = 7" to "x = -y",
So x = -7

Final answer:
x = -7, y = 7

Hope I helped! (:

2x + 2y = 0 (solve by using substitution)
-4x + y = 35

2x + 2y = 0
2x = -2y
x = -y

-4x + y = 35
-4(-y) + y = 35
4y + y = 35
5y = 35
y = 35/5
y = 7

2x + 2y = 0
2x + 2(7) = 0
2x + 14 = 0
2x = -14
x = -14/2
x = -7

∴ x = -7 , y = 7

y = 4x + 35

2x + 8x + 70 = 0
10x = - 70
x = - 7

y = - 28 + 35
y = 7

x = - 7 , y = 7

eq1 y=4x+35
now in eq2
2x+2(4x+35)=0
2x+8x+70=0
10x= - 70
x= - 7
and y=7