exam Maths Puzzle Numerical Ability

Find the slope of the line passing through the points (-8, -3) and (-2, 2).

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exam Other Question

use substitution to solve

2x + 3y = 9
5x - 2y = -25 The demand and supply equations for a certain item are given by:

D = 5p + 40
S = -p^2 + 30p - 8

Find the equilibrium price..... How do I find the price when I am not sure of the actual numbers? Thank you!