Find the value of r so the line that passes through each pair has the given slope.
1. (r,3), (5,9), m=2
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Just use the definition of a slope. Say that we have 2 points and .
The slope is given by:
Plug it all in and simply solve.
The gradient of the line, m, is 2. Now remember when we have two points on a line we can find the gradient using this formula:
Now solve for r.
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