A line passes through the points (1, 3) and (4, 9). Find the equation of the line in slope-intercept form.
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Correct answer: D
Explanation
Points (1, 3) and (4, 9)
According to the formula:
m = (y₂ − y₁) / (x₂ − x₁)
Equation of the line: y = mx + c
m = (9 − 3) / (4 − 1)
m = 6 / 3 = 2
3 = 2(1) + c
3 = 2 + c
c = 1
Therefore,
y = 2x + 1