exam Maths Puzzle Numerical Ability

decide whether lines p1 and p2 are perpendicular:

line p1:x+8y=-4
line p2:4x-2y=10

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exam Other Question

If 6 men can do a piece of work in 4 days, how many men are needed to do the work in 21 days? Solve =

2x2(square) + 3 = 7x