White chocolate costs $4.00 per bar, and dark chocolate costs $5.00 per bar. You buy 15 bars of chocolate for $68 dollars

A) Write the system of equations.
B) How many solutions does this system of equations have?
C) Describe the system of equations graphically by identifying the type
of lines that match the solutions of this system of equations.
D) Explain your solution in terms of chocolate bars.

(A, B,C, D are the steps i had to do to complete this question)