exam Maths Puzzle Numerical Ability

Graph f(x)=-x-2

I am not sure how to come to the solution in order to graph it.

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exam Other Question

Solve.

Mark drove 250 miles to visit Sandra. Returning by a shorten route, he found that the trip was only 225 miles, but traffic slowed his speed by 5 miles. If the two trips took exactly the same time, what was his rate on the return trip? Factor completely:
2x3 - 26x2 + 80x