solve by carmer's rule
2x+3y=42
5x-y=20
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Answer:
2x+3y=42______1 equation
5x-y=20______2 equation
multiply 1 equation by5
10x+15y=210______3 equation
multiply 2 equation by2
10x-2y=40_______ 4equation
subtracting equation 4equation from 3equation
10x+25y=210
10x - 2y= 40
__________
27y=170
y=170/27
put value y into 2equation
5x-170/27=20
5x=20+170/27
5x=710/27
x=710/27×1/5
x=143/27
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