exam Maths Puzzle Numerical Ability

write the equation of the line perpendicular to y=-4 and which passes through point (4,-2)

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exam Other Question

OK I lied I have one more that i dont understand.

-12 divided by 0 -12/0

Would this simply be undefined?? Maybe? During rush hour, Fernando can drive 35 miles using the side roads in the same time that it takes to travel 30 miles on the freeway. If Fernando�s rate on the side roads is 9 mi/h faster than his rate on the freeway, find his rate on the side roads.