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Writing Linear Equations in Slope-Intercept Form

Writing Linear Equations in Slope-Intercept Form 1.11 - Solution

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Ron-Jon and Lena-Jon attempted to write the equation of the line that passes through the points and To determine who is correct, we will find the equation and compare it with their answers. Let's write the equation in slope-intercept form. Here, is the slope and is the intercept. We will find the slope using the slope formula.
Now that we know that the slope of the line is we can partially write its equation. To find the intercept we can substitute either given point into the above equation. Let's use and substitute for and for
Solve for
We can now write the complete equation of the line. We obtained the same equation as Lena-Jon, and thus she is correct. Probably, Ron-Jon substituted the points in the wrong order when finding the slope.