A straight line has the equation $y = mx + c$, where $m$ is the gradient and $c$ is the y-intercept.
For $y = 3x + 2$, the gradient is 3 and the line crosses the $y$-axis at 2. Parallel lines have the same gradient.
Remember
- $y = mx + c$: $m$ = gradient, $c$ = y-intercept.
- Parallel lines share the same gradient.