To find the slope, we will use the formula;
slope =y₂-y₁ / x₂ - x₁
From the points given;
x₁ = 19 y₁ = 3 x₂ = 20 y₂=3
substituting into the equation
slope = 3-3 /20 -19
slope = 0/1
slope = 0
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