exam Maths Puzzle Numerical Ability

the equationof a line with slope m that passes through the point (c,d) is given the formula y-d=m(x-c).
if m=4 and (c,d)=(6,0) which of the followingis an equationof the line

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exam Other Question

The demand equation for a certain printer is given by
D = -200p +35,000

The supply equation is predicted to be
S = -p^2+ 400p - 20,000

Find the equilibrium price?

I just need some help on how to start this problem.
The area of a rectangular field is 42,000 meters squared. Julie finds that by taking a diagonal path instead of walking halfway around the field, she walks 120 meters less. how lon