Question

{X - y = 4
3x + 2y =9

Answer 1

Isola o x
X=4+y

3(4+y)+2y=9. 4+3=7 X=7
12+3y+2y=9
3y-2y=9-12
1y=3
3/1y=3
Y=3

S={(7,3)}