Linear Graphs

Class 9 Maths: linear equations in two variables

Change m and c in y = mx + c and watch the straight line tilt and slide.

Words to know

Slope (m)
How steep a line is; negative means it goes down to the right.
Intercept (c)
Where the line crosses the y-axis.
Origin
The point (0, 0) where the axes meet.
Linear equation
An equation whose graph is a straight line.

Quick check

Answer 3 questions to check what you learned.

1. In y = 3x + 2, where does the line cross the y-axis?
2. Which line slopes down to the right?
3. The graph of y = 4 is…

Try at home

Write a table for y = 2x + 1 with x = 0, 1, 2, 3. Plot the points on squared paper. Do they make a straight line?

Next, try a full lab

Derivative Explorer Regression All Class 9–10 labs