If the three lines above all intersect at exactly one point, what is the value m + b?

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y = mx − 7
y = 12x + b
y = x + 1

If the three lines above all intersect at exactly one point, what is the value m + b?

1) The x-coordinate at the point where all three lines meet is 8
2) The y-coordinate at the point where all three lines meet is 9

OA D