Question

Draw the graph of each of the following linear equations in two variables:
$y=2x$.

Answer 1

$y=2x\cdots \left(1\right)$

To draw the graph ,we need at least two solutions of the equation

Put $x=0$ in $\left(1\right)$

$y=2\left(0\right)=0$

So $(0,0)$ is a solution of the equation

Put $x=5$ in $\left(1\right)$

$y=2\left(5\right)=10$

So $(5,10)$ is a solution of the equation

With these two solutions we can draw graph of $y=2x$