exam Maths Puzzle Numerical Ability

Simplify by combining like terms
(rad)63) -2(rad)28) +5(rad)7 i thought i had it then i didnt please help.
Also am i entering the radical thing the right way? radical of 63 = (rad)63 ? is this ok?

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exam Other Question

Rewrite the equation 2x-3y=-6 as a function of x

Please help me on this to solve it.
A function notation problem

Thanks
question 3x-y<6
x>1
y<3
Please solve graphically, P.S there is a line under each of the <,> symbols.

I thank you in advance for your help.