Ok, so I have to calculate the angle the line y= 5x -7 makes with the X axis. I did m= tan theta, m= -5, which gave me a negative answer.
Sooo... do I add on 180 degrees or do I need to do something else?
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for y = 5x -7 m will equal 5 not -5.
-1/m will give u a tangent to the line out of interest
sorry, y= -5x-7.
if u think about it a line with a gradient m will have the same angle between it and the x axis as -m but on left rather than right hand side of its intercept with the x axis. so it m = -5 will have the same acute angle as m = 5 with the x axis
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