exam Maths Puzzle Numerical Ability

IF
log x / a-b =log y / b - c =log z / c - a
Prove that
xyz = 1

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exam Other Question

Will you help me with substitution?

y=4x
3x-y=1

and

-3x+5y=81
2x+y=24 Solve each formula for the indicated variable.
1. A=1/2bh, for h
2. s=1/2gt squared, for g
3. V=lwh, for w
4. I=prt, for r