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1)x+y=65
x/y=3(5) -->x=3y+5
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(3y+5)+y=65
x=3y+5
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y=15
x=3*15+5
x=50
2)x+y=91
x/y=14(1) --> x=14y+1
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(14y+1)+y=91
x=14y+1
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y=6
x=85
3) (2x+7)/40=2(33)
2x+7=40*2+33-->80+33=113
2x=113-7
x=106/2
x=53
4)x-y=72
x/y=7(6)-->x=7y+6
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(7y+6)-y=72
x=7y+6
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y=11
x=7*11+6
x=83
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