Question

find the value of of x-y if 15x+17y=21 and 17x+15y=11​

Answer 1

Answer:

x - y = -5

Step-by-step explanation:

17x+15y=11 eq 1

15x+17y=21 eq2

subtract eq2 from eq 1

(17x+15y)-(15x+17y)=11-21

17x+15y-15x-17y= -10

2x - 2y = -10

2(x-y) = -10

x - y = -10/2

x - y = -5