exam Maths Puzzle Numerical Ability

x² - 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

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exam Other Question
A triangular tent is 5ft by 7 ft and 7ft at the peak. What is the surface area and volume? Solve the following systems by substitution.

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