exam Maths Puzzle Numerical Ability

Help please. I can not seem to get this problem right.
f(x)=-4x-2
What is the slope?
The y-intercept is (0,?)
Thanks for your help ahead of time!

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exam Other Question

In a regular hexagon, the diagonals are increased by 30%. By what percentage will the area of the hexagon increase as a result? Triangle PQR has vertices P(asqrt3,bsqrt3), Q(a/2sqrt3,3bsqrt3), R(0,5bsqrt3). Prove triangle PQR is isosceles.