Edexcel IGCSE Maths 复习笔记 3.6.2 Straight Lines - Drawing Graphs
How do we draw the graph of a straight line from an equation?
- Before you start trying to draw a straight line, make sure you understand how to find the equation of a straight line – that will help you understand this
- How we draw a straight line depends on what form the equation is given in
- There are two main forms you might see:y = mx + c and ax + by = c
- Different ways of drawing the graph of a straight line:
- From the form y = mx + c
(you might be able to rearrange to this form easily)plot c on the y-axis
go 1 across, m up (and repeat until you can draw the line)
- From ax + by = c
put x = 0 to find y-axis interceptput y = 0 to find x-axis intercept
(You may prefer to rearrange to y = mx + c and use above method)
It might be easier just to plot ANY two points on the line (a third one as a check is not a bad idea either) or use the TABLE function on your calculator.