Question

a) (x–3).(y+ 4) = –7

Answer 1

\(\left[{}\begin{matrix}x-3=-7\\y+4=-7\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-4\\y=-11\end{matrix}\right.\)

Answer 2

\(\Rightarrow x-3;y+4\inƯ\left(-7\right)=\left\{\pm1;\pm7\right\}\)

x-3	1	-1	7	-7
y+4	-7	7	-1	1
x	4	2	10	-4
y	-11	3	-5	-3