Question

A={(a,b) € Z×Z|ab+2a-3b=7}
Please heelp

Answer 1

ab+2a-3b=7
a(b+2)-3(b+2)+6=7
(b+2)(a-3)=1
Cazul 1)
b+2=1⇒b=-1
a-3=1⇒a=4
Cazul 2)
b+2=-1⇒b=-3
a-3=-1⇒a=2
A={(4,-1),(2,-3)}