exam Maths Puzzle Numerical Ability

Help! I am a mother trying to help my son from failing Algebra!

Writing Equations: write in slope intercept form from the equation of the line described..

m = 3 , b = 2

m = 1, b = -1

m = 0, b = 6

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I am trying to figure out (h) in the following problem. A=1/2h(B+b) where as A=80, B=12, and b=8. I have tried it and come up with h=80 but when i plug the number back in it does not balance out. Please help A man takes 1 hour to row 2 km upstream and return. The river has a current of 2 kph. Find the speed of the man in still water.