I need help with this question, who can help me​

How do i do this activity, is appreciated

Given abcd ac=38 and ae=3x+4 find the value of x

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.