exam Maths Puzzle Numerical Ability

Graph Each Function and give the approximate coordinates of the vertex.

41. f(x)=x^2-x+9

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exam Other Question

solve {3x-3y=1
{x+y=4 If 2x - 3y = 0 and 3x + 2y = 13, find x + y. Do I solve for x and y and then just add them. Please show me.