Y-intercept form is y=-3x+19, I’m not sure what you question is
the selling price would be 60.75
You just add all the numbers together:
3 1/8+ 4 1/2+ 4 1/4
=25/8+9/2+17/4
=25/8+36/8+34/8
=95/8
=11 7/8
Ugh.. did you type in the numbers correctly? My guess would be it was meant to be B tho :)
The answer is 6.601, and therefore, the second option.