exam Maths Puzzle Numerical Ability

Determine the value of "r" so the line that passes through each pair of points has the given slope

(6,3)(r,2) slope= 1/2

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exam Other Question

how do you arrange the terms of the polynomial 3x^2+5xy+2y^2 so that the powers of x are in ascending order????
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Solve:(A) (1/27)sqrt3^x=81(^x-1)/9
(B) (cubedsqrt4/2)^6x=2sqrt2
I am worried that I have not typed (B) correctly but if someone could even help me with(A) I would appreciate it .