exam Maths Puzzle Numerical Ability

Solve the following systems by substitution.

4x - 12y = 5
-x + 3y = -1

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exam Other Question

x� - y + 4 = 3x
Need to solve for y in terms of x - line by
line and tell if a function or not -why or
why not
Thanks (4a^3B/a^2B^3)(3B^2/2a^2B^4)