exam Maths Puzzle Numerical Ability

Determine whether the ordered pair is a solution of the inequality

(-4,8); 7x+y<-9

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Write in slope-intercept form the equation of the line passing through (1,3) and (-5,-1). Show that this line is perpendicular to the line y=-3/2x+17. thanks 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.