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If you know the slope and x-intercept, writing the equation to a line is easy. For example, if you know the x-intercept to be 3, and the slope to be 2, then you plug it into the equation y=mx+b. At the point where the line hits the x-intercept, the y-value is 0, meaning you actually have a data point (3,0). Plug this into your equation:

0=3(2)+b

0=6+b

-6=b

b=-6

Then you put the equation together, as you know m and b:

y=2x-6

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Q: How would you find the equation of a line if given the slope and x intercept?
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