exam Maths Puzzle Numerical Ability

Solve by elimination:

2x+3y=21
5x-2y=-14

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exam Other Question

1x/2 + 1y/3 = 1/3
1x/6 + 1y/3 = 29 Solve for "x" in each of the following logarithmic equations.
a) x=logbase6 9 + logbase6 8 - logbase6 2
b) x=logbase8 sqrt80 - logbase8 sqrt5