Answer:
24GB
Step-by-step explanation:
75.99-59.99=16 This is how much extra money was paid.
16/4=4 Divide this by the cost per GB.
20+4=24GB Add the 20GB included in the plan.
First you move. -x for +x
2y = 16 + x
y = 8 + 1/2 x
the answer is
y = 1/2x + 8
1 1/2 is the correct answer
