exam Maths Puzzle Numerical Ability

i have to write an equation for the line containing the indicated points.
(0,0) (3,30)
please help by showing me how to do this!!!!

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exam Other Question

Martina leaves home at 9 A.M., bicycling at a rate of
24 mi/h. Two hours later, John leaves, driving at the rate of 48 mi/h. At what time will John catch up with Martina? -3x - y = 2