exam Maths Puzzle Numerical Ability

Solve the following systems by substitution
8x - 4y = 16
y = 2x - 4

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exam Other Question

PLease help to solve

2x - y - z = -5
-2x + 2y - z = 5
x + 3y + z =6 find a counterexample, that is, find real values for which the statement is false.
a/b=b/a