exam Maths Puzzle Numerical Ability

1. y=3x-1
If x=-2 what is the value of Y.

2. for the equation y = x-5 find the missing value in each ordered pair
(2, ??)
(-3,??)

3. x-y =3
If x =-6 what is the value of Y

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exam Other Question
find function f such that g(x)= 1/x-5
h=g o f, and h(x)=1/(x^2-5)

Thank you! the demand and supply equations for a certain item are given by
D= -5p+40
s= -p+30p-8
Find the equilibrium price.