This key facts covers The y = mx + c Formula Breakdown within y = mx + c for GCSE Mathematics. Revise y = mx + c in Graphs for GCSE Mathematics with 10 exam-style questions and 20 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 2 of 10 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
The y = mx + c Formula Breakdown
- y: The output value (dependent variable)
- m: The gradient (slope) - how steep the line is
- x: The input value (independent variable)
- c: The y-intercept - where the line crosses the y-axis
- +: Can be + or - depending on whether c is positive or negative
Practice questions for y = mx + c
For the line y = 3x – 2, what is the gradient?
Two students write down equations for parallel lines: Student A writes: y = 2x + 1 Student B writes: y = 2x + 1 Explain why these two lines are NOT parallel to each other.
Quick recall flashcards
What gradient gives a 45° line?
m = 1 (rises 1 unit for every 1 unit across)
What is special about y = mx?
It passes through the origin (0, 0) because c = 0.