First assign variables:
r = red licorice
b = black licorice
Then create your system:
r + b = 35
r = 4b
Solve by substitution:
(4b) + b = 35
5b = 35
b = 7
r = 4(7)
r = 28
Then put each equation into slope-intercept form to graph them:
r = -b + 35
The second equation is already in slope-intercept form.
Graph them (use r in place of y and b in place of x)
Then for part c just write that the system tells us how many of each piece she has.
