SOLUTION: y=3x-8 y=4-x

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Question 563804: y=3x-8
y=4-x
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
-3 x + 1 y = -8 .............1
1 x + 1 y = 4 .............2
Eliminate y
multiply (1)by -1
Multiply (2) by 7
3 x -1 y = 8
7 x 7 y = 28
Add the two equations
10 x = 36
/ 10
x = 3.60
plug value of x in (1)
-3 x + 1 y = -8
-10.8 + 1 y = -8
1 y = -8 + 10.8
1 y = 2.8
y = 2.80