Answer: y = 3
Step-by-step explanation:
Parallel to the x-axis means slope (m) = 0
Input the given point (1, 3) and the slope into the Point-Slope formula:
y - y₁ = m(x - x₁)
y - 3 = 0(x - 1)
y - 3 = 0
y = 3
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