The sum of the cost of dinner d and a $12 tip divided equally between 3 people
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In this problem, you have to find the y- intercept of 
. I graphed mine into a graphing calculator. An algebraic way to find it is to input x=0 in the function. The y-intercept is 5. You can see the y-intercept for the new one is -2. That means we shifted the graph down 7 units. (Vertical Shift down 7)
k=-7
k=-7