SOLUTION: 20.2x+4y=40 7x-3y=4

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Question 179186This question is from textbook algebra 1
: 20.2x+4y=40
7x-3y=4 This question is from textbook algebra 1

Answer by checkley75(3666) About Me  (Show Source):
You can put this solution on YOUR website!
2x+4y=40 multiply by 3
7x-3y=4 multiply by 4 & add
6x+12y=120
28x-12y=16
----------------
34x=136
x=136/34
x=4 ans.
2*4+4y=40
8+4y=40
4y=40-8
4y=32
y=32/4
y=8 ans.
Proof:
7*4-3*8=4
28-24=4
4=4