5.) The slope of line FG is given. What is the slope of a line that i) parallel to FG? ii)perpendicular to FG?

( picture above is underneath i and ii )
please help

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.