Question

15x + 17y = 21 ; 17x + 15y = 11​

Answer 1

x=-2

y=3

Step-by-step explanation:

15x+17y 21 eq1

17x+15y=11 eq2

step1

eq1+eq2

32x+32y=32

x+y=1. ....eq3

and

step2

eq1-eq2

15x+17y=21

17x+15y=11

2x-2y=-10

x-y=-5. ......eq4

step3

eq3+eq4

x+y=1

x-y=-5

2x=-4

x=-2

x+y=1

-2+y=1

y=3