The change in 𝑦 divided by ÷ the change in 𝑥 always gives the gradient as \(\frac{-1}{2}\). The line crosses the 𝑦-axis at 3, so the 𝑦-intercept is 3. Back to top Equation of a line ...

Watch this video to learn about the equation of a straight line. Since we are given 2 points that already lie on the line, using the formula as before, we need to calculate the gradient first.