2x+5y=45
5x+78=87
solve by cross multiplication
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2x+5y=45........(1)
5x+78=87
5x=11
x=11/5
substituting x=11/5 in (1)
2x+5y=45
2(11/5)+5y=45
22/5+5y=45
22+25y/5=45
22+25y=225
25y=203
y=203/25
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