SOLUTION: x-3y=-1 2x-7y=-1 substitution method

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Question 833308: x-3y=-1
2x-7y=-1
substitution method
Found 2 solutions by JulietG, TigerAlgebra:
Answer by JulietG(1812) About Me  (Show Source):
You can put this solution on YOUR website!
x-3y=-1
2x-7y=-1
.
Add 3y to each side of the first equation
x = 3y-1
Now take that value and substitute it for the x value in the second equation
2(3y-1) - 7y =-1
Distribute
6y-2-7y = -1
Add 2 to each side
6y-7y = 1
Subtract
-y = 1
Multiply by -1 on each side
y = -1
.
If y is -1, then x is (3*-1)-1, -3-4 = -4

Answer by TigerAlgebra(40) About Me  (Show Source):