The slope of the best fit regression line can be found using the formula .

The y-intercept of the best fit regression line can be found using the formula .

Sum up the values of the first column of data .

Simplify the expression.

Sum up the values of the second column of data .

Simplify the expression.

Sum up the values of .

Simplify the expression.

Sum up the values of .

Simplify the expression.

Sum up the values of .

Simplify the expression.

Fill in the computed values.

Simplify the expression.

Fill in the computed values.

Simplify the expression.

Fill in the values of slope and y-intercept into the slope-intercept formula.

Find the Regression Line table[[c,y],[15,120],[45,60],[75,30],[105,15],[135,7.5],[165,3.75],[195,1.875],[225,0.9375],[255,0.46875],[285,0.234375]]