Question
Write four solutions of the equation: $2x + y = 7$
✓
Answer
$2x + y = 7$
$\Rightarrow y = 7 – 2x$
Put $x=0$, we get $y=7-2(0)=7-0=7$
Put $x=1$, we get $y=7-2(1)=7-2=5$
Put $x=2$, we get $y=7-2(2)=7-4=3$
Put $x=3$, we get $y=7-2(3)=7-6=1$
$\therefore$ Four solutions are $(0,7),(1,5),(2,3)$ and $(3,1)$.
$\Rightarrow y = 7 – 2x$
Put $x=0$, we get $y=7-2(0)=7-0=7$
Put $x=1$, we get $y=7-2(1)=7-2=5$
Put $x=2$, we get $y=7-2(2)=7-4=3$
Put $x=3$, we get $y=7-2(3)=7-6=1$
$\therefore$ Four solutions are $(0,7),(1,5),(2,3)$ and $(3,1)$.
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