Complete the equation of the graphed linear function. write the slope in decimal form.

y = x +

Every straight line graph has an equation in the same form:

             y  =  (slope of the line) x  +  (y-intercept) .

-- The slope of the line is

     (how far it goes UP, going left to right between any 2 points)
divided by
     (how far it goes left to right between the same 2 points) .

The line on this graph has a slope of  + 1/2 .

-- The y-intercept is the point where the line crosses the y-axis.
The line on this graph crosses the y-axis at  -1 .

                       y  =  (slope of the line) x  +  (y-intercept) .                     

                       y  =      ( 0.5 ) x                            ( - 1 ) .

The percent discount was 120

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