SOLUTION: Please help me solve this linear equation. I am supposed to use substitution and I can't figure it out. x + y = 45 0.8x + 0.6y = 31

Algebra ->  Coordinate Systems and Linear Equations -> SOLUTION: Please help me solve this linear equation. I am supposed to use substitution and I can't figure it out. x + y = 45 0.8x + 0.6y = 31      Log On


   

Question 701052: Please help me solve this linear equation. I am supposed to use substitution and I can't figure it out.
x + y = 45
0.8x + 0.6y = 31
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
y=-x+45
0.8x+0.6(-x+45)=31
0.8x-0.6x+27=31
0.2x=31-27
0.2x=4
x=4/0.2
x=20
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0.8*20+0.6y=31
16+0.6y=31
0.6y=31-16
0.6y=15
y=15/0.6
y=25
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20+25=45