exam Maths Puzzle Numerical Ability

how do you find the slope of the line passing through the given points
ex. (2,1),(6,9)

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exam Other Question

The area of a rectangle of length x is given by 3x2 + 5x. Find the width of the rectangle (This requires knowledge of the formula for area of a rectangle)??? I just don't get it. Yn = 74

Assume that a circuit in your house has items connected to it that consume 8 amps of a 15 amp circuit. You are going to connect (Yn) - 100 watt bul