exam Maths Puzzle Numerical Ability

I am stuck on correct answer for:

(y^2 - 4y + 3) - (4y^2 + 5Y - 2) =

I am not using any specific book. I am just practicing...

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exam Other Question

Write an equation of the line satisfying the given conditions. The line is perpendicular to the x-axis and passes through (-6, -4).

Thank you! 6x - 2y when x=-1and y =4