Equation of a Line (Junior Cert Mathematics): Flashcards

A mathematical rule describing every point on the line

Point-Slope Formula and Slope-Intercept Formula

When you know the slope and a point on the line

$y - y_1 = m(x - x_1)$

The slope of the line

A point on the line

When you know the slope and y-intercept

$y = mx + c$

The slope of the line

The y-intercept (where line crosses y-axis)

Plug in a value for $x$ and solve for $y$