SOLUTION: Solve the system of equations by substitution. 3x − y = 12 2x − 2y = 20 (x, y) =

Algebra ->  Probability-and-statistics -> SOLUTION: Solve the system of equations by substitution. 3x − y = 12 2x − 2y = 20 (x, y) =      Log On


   

Question 478435: Solve the system of equations by substitution.
3x − y = 12
2x − 2y = 20
(x, y) =
Answer by Tatiana_Stebko(1539) About Me  (Show Source):
You can put this solution on YOUR website!
system%283x-y=12%2C+2x-2y=20%29
From the first equation -y=12-3x, or y=-12%2B3x substitute into the second equation
2x-2%28-12%2B3x%29=20
2x%2B24-6x=20
-4x=20-24
-4x=-4
x=1
substitute x=1 into the first equation y=-12%2B3%2A1
y=-9
Answer (1,-9)