SOLUTION: 2y+x=0 x=y+9 Solve by substitution.

Question 626826: 2y+x=0
x=y+9
Solve by substitution.
Answer by Maths68(1474) (Show Source): You can put this solution on YOUR website!
2y+x=0.......(1)
x=y+9........(2)
Substitute the value of x from (2) to (1)
2y+x=0
2y+(y+9)=0
2y+y+9=0
Subtract 9 from the both sides
2y+y+9-9=0-9
3y=-9
Divide by 3 both sides
3y/3=-9/3
y=-3
Put the value of y in (2)
x=y+9........(2)
x=-3+9
x=6
x,y=6,-3

Check
=====
Put the value of x and y in (1)
2y+x=0.......(1)
2(-3)+6=0
-6+6=0
0=0
Put the value of x and y in (1)
x=y+9........(2)
6=-3+9
6=6

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