Answer:
Slope = -2
Step-by-step explanation:
slope = (y₂ - y₁)/(x₂ - x₁)
s = (6 - 0)/(-3 - 0)
s = 6 / -3
s = -2
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x = 9
-2x = 18 - 4x
-2x + 4x = 18
2x = 18
x = 18/2