Write four solutions for equations : $2x + y = 7$

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 When $x=0$,              $2(0)+y=7$                 $\Rightarrow 0+y=7$

$\Rightarrow $              $y=7$                        $\therefore$ Solution is $(0,\,7)$.

When $x=1$,              $2(1)+y=7$                  $\Rightarrow y=7-2$

$\Rightarrow $              $y=5$                        $\therefore$ Solution is $(1,\,5)$.

When $x=2$,              $2(2)+y=7$                  $\Rightarrow y=7-4$

$\Rightarrow $              $y=3$                        $\therefore$ Solution is $(2,\,3)$.

When $x=3$,              $2(3)+y=7$                  $\Rightarrow y=7-6$

$\Rightarrow $              $y=1$                        $\therefore$ Solution is $(3,\,1)$.

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