SOLUTION: -x-7y=18 4x+7y=-30

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Question 561643: -x-7y=18
4x+7y=-30
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
-1 x -7 y = 18 .............1
4 x + 7 y = 30 .............2
Eliminate y
multiply (1)by 1
Multiply (2) by 1
-1 x -7 y = 18
4 x 7 y = 30
Add the two equations
3 x = 48
/ 3
x = 16
plug value of x in (1)
-1 x + -7 y = 18
-16 + -7 y = 18
-7 y = 18 + 16
-7 y = 34
y = -4.86 OR -34/7