This key facts covers Essential Facts About Straight Line Graphs within Straight Line Graphs for GCSE Mathematics. Revise Straight Line Graphs in Graphs for GCSE Mathematics with 14 exam-style questions and 20 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 2 of 8 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Essential Facts About Straight Line Graphs
- Linear relationship: One variable changes at a constant rate with respect to another
- Straight line: All points lie on the same straight line
- General form: y = mx + c (where m = gradient, c = y-intercept)
- Gradient: How steep the line is (rise over run)
- Y-intercept: Where the line crosses the y-axis
Practice questions for Straight Line Graphs
A straight line has the equation y = 3x + 7. What is the gradient of this line?
Line A has equation y = 3x + 1. Line B has equation y = 3x - 5. Explain why lines A and B are parallel. Include the values of their gradients in your answer.
Quick recall flashcards
What is a linear relationship?
A relationship where one variable changes at a constant rate with respect to another, producing a straight line graph.
What is the y-intercept?
The point where the line crosses the y-axis, found when x = 0.