exam Maths Puzzle Numerical Ability

is it possible to use the substitution method to solve a linear system always?

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exam Other Question

if (2,4) is the location of the centroid of a triangle. which CANNOT be the coordinates of the verticles of the triangle?
F= (0,0),(0,6),(6,6)
G=(3,4),(3,-2),(0,6)
H= (3,-2),(1,6),(2,8)
J= (2,0) ,(1,8),(3,4) I'm having some trouble with the following problem.

A fish swims at a speed v relative to the water, against a current of 4.8 mi/h. Using a mathematical model of energy expendi