exam Maths Puzzle Numerical Ability

Find the maximun value of z=3x +2y subject tothe contraints x>=0, y>=0, x+2y<=4, x-y<=1

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exam Other Question

I dont understand rational expression with extraneous values. a taxicab ride that is 2 miles long cost $7. One that is 9 miles long cost $24.50. Write an equation relating cost to length of ride.