exam Maths Puzzle Numerical Ability

Determine whether the graph of 2 equations are perpendicular.

y=3X-7
4Y=3-x

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exam Other Question

In finding the illummination at a point x m from one of two light sources that are 100m apart, it is necessary to solve the equation 9x^3-2400x^2+240000x-8000000=0 .Find x This is really tough. Find the solution polynomial P(x) given zeros at: i, and - 3 +√3 (assume P(x) has rational coefficients).