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Finding the Slope on a Geoboard
A rubber band is stretched between two pegs on a geoboard, creating a line that falls from left to right. To determine its slope, a right triangle is formed starting at the left peg.
Using the slope definition , count the vertical and horizontal distances from the left peg to the right peg:
- The line drops unit downward, so the rise is .
- The line moves units to the right, so the run is .
Substituting into the formula:
The slope is , which means the line drops unit for every units of horizontal distance. Because the rise is negative (the line goes downward from left to right), the slope is negative.
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Elementary Algebra @ OpenStax
Ch.4 Graphs - Elementary Algebra @ OpenStax
Algebra
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Learn After
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