exam Maths Puzzle Numerical Ability

use substitution method

x-y=5
2x=2y+14

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exam Other Question

Decide whether the values of the variables listed are solutions of the system of equations.

3x + 3y + 2z = 4
x - y - z = 0
2y - 3z = -8

x= 1, y= -1, z= 2 A man walks at a pace of 3 miles per hour. After 2 hours he stops for a rest. Let Y be time AFTER the rest when he continues on his walk. Let Z be the TOTAL distance traveled since he started. I need an equation linking Z to Y.