We can read the $y$-intercept, $b$, off the graph:

• The graph crosses the $y$-axis at $y=\var{b}$ therefore the $y$-intercept is $b=\var{b}$.

We can find a 'nice point' with whole number coordinates and its rise and run from the $y$-intercept to determine the gradient, $m$, of the line:

• The 'nice point' $(\var{point_x},\var{point_y})$ has whole number coordinates, and
• to get to it from the $y$-intercept requires a rise up of $\var{rise}$ and a run across of $\var{run}$.
• Therefore the line has a gradient of $m=\frac{\text{rise}}{\text{run}}=\frac{\var{rise}}{\var{run}}$.

We can now write the equation of the line, $y=mx+b$, as $\simplify{y={rise}/{run}x+{b}}$. 

We can read the $y$-intercept, $b$, off the graph:

• The graph crosses the $y$-axis at $y=\var{bb}$ therefore the $y$-intercept is $b=\var{bb}$.

We can find a 'nice point' with whole number coordinates and its rise and run from the $y$-intercept to determine the gradient, $m$, of the line:

• The 'nice point' $(\var{bpoint_x},\var{bpoint_y})$ has whole number coordinates, and
• to get to it from the $y$-intercept requires a rise up of $\var{brise}$ (since we have to go further down) and a run across of $\var{brun}$.
• Therefore the line has a gradient of $m=\frac{\text{rise}}{\text{run}}=\frac{\var{brise}}{\var{brun}}$.

We can now write the equation of the line, $y=mx+b$, as $\simplify{y={brise}/{brun}x+{bb}}$.