exam Maths Puzzle Numerical Ability

Can someone please explain how to figure this problem? Determine the equation of the line that has a slope of -3 and passes through the point (-3,0). Write the equation in slope intercept form.

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exam Other Question

A plane flies 560mi in 1.75 hr traveling with the wind. The return trip later against the same ind takes the plane 2 hrs. Find the speed of the plane and the speed of the wind. If there are 6 x 109 people on the Earth and there is enough freshwater to provide each person with 8.79 x 105 L, how much freshwater is on the Earth?