exam Maths Puzzle Numerical Ability

Describe how solving an absolute value equation such as ∣ 2x -1∣ =3 is similar to solving an absolute value equation such as ∣ 2x-1∣ = ∣ x-5∣

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exam Other Question

The demand and supply equations for a certain item are given by
D = �5p + 40
S = �p2 + 30p � 8
Find the equilibrium price.
The question says: Determine whether each ordered pair is a solution of y = -2x + 5.

1.) (3, -5)
2.) (2.5, 0)

Please explain how you got the answers. Thanks