exam Maths Puzzle Numerical Ability

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Find the slope of the line passing through the points (4,0) & (4,5)

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exam Other Question

Suppose r>0 in the equation x^2 + px + r = 0.

a. the roots cannot be determined from the equation.

b. the equation has two real unequal roots.

c. the equation has one real root.

d. the roots must both be positive. y=-1/2x +1

if x = -2
if x = -1

if y = 1
if y = 1/2