exam Maths Puzzle Numerical Ability

Will you help me with substitution?

y=4x
3x-y=1

and

-3x+5y=81
2x+y=24

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exam Other Question

Solve the following system by graphing.

3x - 6y = 9
x - 2y = 3 IF
log x / a-b =log y / b - c =log z / c - a
Prove that
xyz = 1