book Maths Puzzle Numerical Ability

Solve x+3=|2x|by graphing f(x)= x+3 and g(x)= |2x|.

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book Other Question

What is the solution to the system of equations x(squared) -x+6= y and 2x+2y=36?
Also how do you get your answer? The vertex of a parabola is at (-4,-3). If one x-intercept is at (-11,0), what are the coordinates of the other x-intercept?