book Maths Puzzle Numerical Ability

must solve using substitution

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

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book Other Question

Please help me rationalize the expression 2sqrt3+sqrt2/sqrt3-sqrt2 so there are no radicals in the denominator. I came up with 4-sqrt6
Thanks a lot please change the graction w-3/w+5 into an equivalent fraction with the denominator of w2 + w - 20, thank you!!