Demystifying - Lines not written as y = mx + c

Author note — to cover

Rearrange forms like 2x + 3y = 6 and x + y = 4 into y = mx + c before reading gradient and intercept, and decide whether pairs of such lines are parallel; name the trap of quoting the unrearranged x coefficient as the gradient. Both tiers. (A9, A10)

Introduction

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Practice and continue

Practice

Lines not written as y = mx + c

Rearranging equations like 2x + 3y = 6 before reading the gradient off.

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The line through a point with a given gradient

Substituting the point into y = mx + c to find c, then writing the equation out.