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Topic review (newest first)
At (-2,4): 4 = m(-2) + b → b = 4+2m
At (-2,4): 4 = m(-2) + c → c = 4+2m
Have a go ... copy and paste what I did and make the needed changes - I think you will still end up with a quadratic equation. Post your answer here so I can see.
Sorry I see what was wrong I made a mistake when typing the question. I should have been x1 + y1=-4 not x1 + y1=-4m . Thanks for all your help though. Can your method still work with this equation?
Something seems worng as I checked the answer at the back of the book and the answers for m were supposed to be either -1 or 2
I think it is just a bunch of formulas to solve.
6(C) A line containg the point(-2,4) has a slope of m which is not equal to zero. The line intercepts the x-axis at (x1,0) and the y axis at (0,y1) If x1 + y1=-4m find the slopes of the two lines that satisfy this condition. Hence find the tangent of the acute angle between these two lines.