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Finding the Equation of a Line with Slope and y-Intercept
To find the equation of a line when its slope and y-intercept are given, substitute the values directly into the slope-intercept form .
Given: slope and y-intercept , so .
Step 1 — Identify the slope: .
Step 2 — Identify the y-intercept: The y-intercept is , so .
Step 3 — Substitute into :
The equation of the line is . This approach is the most direct way to write a line's equation — when both the slope and y-intercept are already known, no further algebra is needed beyond plugging the values into the formula and simplifying.
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Elementary Algebra @ OpenStax
Ch.4 Graphs - Elementary Algebra @ OpenStax
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Learn After
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