book Maths Puzzle Numerical Ability

must solve using substitution

-2x+y=6
y=3x+9

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book Other Question

A pair of 8 sided dice have sides numbered 1 through 8. Each side has the same probability of landing face up. Find the probability that the product of the 2 numbers on the sides that land face up exceeds 36. what do they mean by find the LCM of 2 certain numbers