Diketahui 5x+2y=-3 7x+8y=1 Nilai x-y adalah……Pakai cara! a.-2 b.-1 c.0 d.1

5x + 2y = - 3 |kali 4|
7x + 8y = 1   |kali 1|
_________________ -
13x = - 13
x = - 1
y = 1

x - y = - 2

5x+2y=-3
7x+8y=1
20x+8y=-12
7x+8y=1
13x=-13
x=-1
5x+2y=-3
5.-1+2y=-3
y=-3+5:2
y=1
x-y=-1-1=-2