Solve the proportion for “m”. 4/12=m/39

What is the slope of the equation y =

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.

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.