Question

Find the value of y, when $x=-3$ in the graph of equation $x+2y-3=0$

Answer 1

The given equation is $x+2y-3=0⟹y=\frac{-x+3}{2}$

$x$ is the independent variable

We can assign any values and obtain the above graph

Let $x=0,y=\frac{3}{2},x=-9,y=6$

The ordered pairs are $(0,\frac{3}{2}),(-9,6)$Now we plot them on a graph

From the graph the value of $y$ when $x=-3$ is $3$