book Maths Puzzle Numerical Ability

y + 2 =mx; 8x -2y = -1 find the value of m

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book Other Question

x-2y=2
2x+3y=11

use substitution method to solve system
if dependant or inconsistant so indicate Are these the right steps to get the standard form to the vertex form

f(x) = ax^2 + bx + c
f(x) = a (x^2 + b/a) + c
f(x) = a (x^2 + b/a + b^2/4a) + (c - b^2/4a)
f(x) = a (x +