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how to solve a=7a+(n-3)d for d

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Find the equation of the line that passes through the pair of points ( 3,6 ) and ( -4,-1 ). Write the answer in standard form:

For this, you want to start by calculating the slope of the line, which you can find from two points: 

m = y2-y1/x2-x1   where m is the slope in the form of the equation y = mx + b

Once you have the slope, m, you can plug in x and y from either of the two points to solve for b :) 

Good luck!

Hint: Remember standard form is: Ax + By = C