The line equation in slope-intercept form is y = mx + b, where m is the slope and b is the y-intercept.

Write the two functions as co-ordinates.

First find the slope

         (Substitute )

            (Product of two same signs is positive)

               (Subtract: )

                  (Add: 2 + 1 = 3)

                    (Divide: )

Next find the y-intercept

Substitute the slope and the coordinates of the given point in slope-intercept form equation.

y = mx + b

15 = –2(–2) + b                   (Substitute – 2 for m, – 2 for x, and 15 for y)

15 = 4 + b                            (Multiply: )

15 – 4 = 4 – 4 + b               (Subtract 4 from each side)

15 – 4 = b                            (Apply additive inverse property: 4 – 4= 0)

b = 11                                  (Subtract: 15 – 4 = 11)

Finally write the line equation

Substitute the values of slope ‘m’ and y-intercept ‘b’ in slope intercept form line equation.

y = mx + b

y = –2(x) + 11                    (Substitute –2 for m and 11 for b)

y = –2x + 11                      (Simplify)

The function is y = –2x + 11.