The graph shows a system of which two equations? A.) y = x - 18 and y = x + 4
B.) y = -x +18 and y = 4/3x + 4
C.) y = 18x and y = 4x
D.) y = -x + 18 and y = 3/4x + 4

Help please!!

What is the vertex form of f(x) = x2 + 6x + 3

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