book Maths Puzzle Numerical Ability

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

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book Other Question

Write the equation of the line with slope 4 and y-intercept (0,5). must solve using substitution

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