SOLUTION: solve by substitution: 1: x-y=-8 y=3x 2: 2x+y=1 x=8-3y Solve: 3:x+y=20 -2x+y=5 4:3x+y=8 x-y=12

Algebra ->  Coordinate Systems and Linear Equations -> SOLUTION: solve by substitution: 1: x-y=-8 y=3x 2: 2x+y=1 x=8-3y Solve: 3:x+y=20 -2x+y=5 4:3x+y=8 x-y=12      Log On


   

Question 370279: solve by substitution:
1: x-y=-8
y=3x
2: 2x+y=1
x=8-3y
Solve:
3:x+y=20
-2x+y=5
4:3x+y=8
x-y=12
Answer by Alan3354(69443) About Me  (Show Source):