book Maths Puzzle Numerical Ability

need help finding thr point of intersection for 8x-2y=5
-12x+3y=7

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book Other Question

If log (base of 3) 8=1.8928 and log (base of 3) 2=0.6309, what is the value of log (base of 3) 16? 10 2/3 devided by 32/3 =