exam Maths Puzzle Numerical Ability

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)???

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exam Other Question

Can anyone help me out with this one?

P(-6,3), y + 3x = -12

Directions are to write the equation of the line that passes through the given point and is parallel to the given line. Write the answer in slope-intercept form.

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