equal your equations to each
so now just plug in x into one of your original equations and it will give you your y
If you have any questions feel free to ask.
i have two tangents that i have the equations to. the question asks to find the co-ordinates were the two tangents intersect. i am guessing that i will have use the two tangent equations in a similtaneous equation but i dont know how can some one help me ? the two equations are Y=5x-90 at x=5 and y=-16x-2024 at x=6
x^3-6x^2-31x+120 was the original function the question was to take a point one with a posotive gradient and one with a negative gradient on the cubic that i found from the equation x^3-6x^2-31x+120 and draw a tangent i then had to work out the tangent equation. i then had to extend the tangents until they intersect and find the co-ordinate at which they intersect