Learn Before
Verifying the Slope and y-Intercept of from its Graph
To demonstrate the connection between a line's graph and its slope-intercept form, the slope and y-intercept of can be read directly from the graph and then compared to the equation.
The graph passes through the points and .
Step 1 — Find the slope from the graph. Starting at and moving to , count the rise and run:
Step 2 — Find the y-intercept from the graph. The line crosses the y-axis at the point .
Step 3 — Compare to . The values found from the graph are slope and y-intercept . Looking at the equation :
- The coefficient of is , which matches the slope.
- The constant term is , which matches the y-coordinate of the y-intercept.
This confirms that when a linear equation is written in slope-intercept form, the coefficient of is always the slope that can be measured from the graph, and the constant term is always the y-coordinate of the point where the line crosses the y-axis.
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Elementary Algebra @ OpenStax
Ch.4 Graphs - Elementary Algebra @ OpenStax
Algebra
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Prealgebra
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Learn After
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A facilities manager is verifying a maintenance cost graph that follows the linear equation . To confirm the slope of the line, the manager identifies the points and on the graph. According to the standard verification process, what is the value of the horizontal 'run' between these two points?
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