solve 3x+5y=4 and 2x-3y=9
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3x+5y=4 equation no1×2
2x-3y=9 equation no2×3
6x+10y=8
6x-9y=27
19y=-19
y=-1
put in y equation no1
3x+5y=4
3x+5×-1=4
3x=4+5
3x=9
x=3
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