exam Maths Puzzle Numerical Ability

Find an equation in the form y=mx+b(where possible) for eacjh line.
Through (0,5), perpendicular to 8x+5y=3

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exam Other Question

-2/3x + 1 = 7 A passenger plane made a trip to Las Vegas and back. On the trip there it flew 432 mph and on the return trip it went 480 mph. How long did the trip there take if the return trip took nine hours.