คำศัพท์คณิตศาสตร์
TOPIC Linear equations and straight line graphs
An equation can be represented by graph.
Three is a relationship between the equation and the shape of the graph.
A linear equation of the form y = mx + c can be represented by a straight line graph.
m determines the gradient of the straight line and c determines where the graph intercepts the y axis.
Investigation of graphs of linear equations
Write on the board:
The y number is the same as the jt number plus 1. Ask students to write down three pairs of co-ordinates which follow this rule. Plot the graph.
Change the rule:
The y number is the same as the x number plus 2.
Ask students to write down three pairs of co=ordinates which follow this rule. Plot the graph on the same set of axes.
Ask students what they notice about the gradients of the straight line graphs and the intercepts on the y axis.
Ask students to write the rule on the board as algebraic equations.