You might need to check some of your points that you've plotted - hopefully you should get two straight lines - one for y = 2x - 1 and one for y = 2x + 3
Check that your co-ordinates fit this rule - e.g. what happens when x = 3? In the first line, y = 2*3 - 1 = 5 so I would need to plot the point (3, 5)
They all mostly fit in a line so you have to use a line of best fit
ReplyDeleteYou might need to check some of your points that you've plotted - hopefully you should get two straight lines - one for y = 2x - 1
Deleteand one for y = 2x + 3
Check that your co-ordinates fit this rule - e.g. what happens when x = 3?
In the first line, y = 2*3 - 1 = 5 so I would need to plot the point (3, 5)