find the value of x-y for the simultaneous equation 15x+17y=21; 17x+ 15y =1
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Answer:
15x+17y=21
17x+15y=1
---------------subtract
-2x+2y=20
take 2 as common
2(y-x)=20
y-x=10
multiply with minus on noth sides
-(y-x)=-(10)
x-y=-10
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