exam Maths Puzzle Numerical Ability

Please show me how to do this. I have abunch of chapter questions that I have t practice on

Find an equation for the line with y-intercept 3 that is perpendicular to the line y

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exam Other Question

Solve this word problem. The cost of 1000 cubic feet of natual gas is $39 and the cost of 3000 cubic feet is $99. There is a linear equation that expresses the cost C in terms of t The Volume of spheres are proportional to the cubes of their radii. Two spheres of the same material weigh 3.6 kg and 2.7 kg and the radius of the smaller one is 2 cm. If the two were melted down and formed into a single sphere,what would be the radius..?