exam Maths Puzzle Numerical Ability

Please explain to me how to graph the line: x=-4, and also how to graph the line: y=2

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exam Other Question

The measure of the supplement of an angle is 20 degrees more than three times the measure of the original angle. Find the measures of the angles. My problem is if the vertex of f(x)=x^2+bx+c is at (2,4), find b and c.