Question

find the value of x-y for the simultaneous equation 15x+17y=21; 17x+ 15y =1​

Answer 1

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