система 2x-3y=5 2x+5y=16

Question

система

2x-3y=5

2x+5y=16

Answer 1

2x-3y=5
2x+5y=16 
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2x=5+3y
2x+5y=16 
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x=(5+3y)/2
2x+5y=16 
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2((5+3y)/2)+5y=16
5+3y+5y=16
8y=11
y= 1 3/8
x=(5+3*1 3/8)/2=4.5625