exam Maths Puzzle Numerical Ability

Find the value of r so that the line through (-4,3) and (r, -3) has a slope of 2/3.

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exam Other Question

Determine the x- intercepts of the graph of p(x) = (x + 8)^2 (x - 12) (x - 10).
For each x-intercept, determine whether the graph of p crosses the x-axis or
intersects but does not cross the x-axis.
Write the equation of the line L satisfying the given geometric conditions.

L has y-intercept (0, 2) and is perpendicular to the line with equation 2x -3y =6.