1. Draw a diagram : Does not have to be accurate, rough idea.
2. Ensure you can caluclate the gradient (m) correctly :
Gradient of a line ; m = change in y/change in x
Gradient of line joining two points ; m = (y2 - y1)/(x2 - x1)
3. Make sure you can calculate the y-intercept of a straight-line graph : y-intercept is where line crosses y-axis when x = 0.
4. Understand the equation of a straight line : y=mx+c
m=gradient
c=y-intercept.
5. Understand the conditions on the gradients of lines for the lines to be parallel or perpendicular :
Parallel - m1=m2
Perpendicular - m1 x m2 = -1
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