-5 is the answer I believe
Answer:
Correct option is D 
Step-by-step explanation:
Let the laptop's original cost be = L
After 20% discount its price will be (100 - 20)% × L = 0.8L
8% sales tax on this price = (100 + 8)% × 0.8L = 1.08 × 0.8L
So, p = 1.08 × 0.8L
⇒ L = 
The answer to your question is x = -3
Answer:
y = 39
Step-by-step explanation:
y = 4 + 5x
substitute 7 for x
y = 4 + 5(7)
y = 4 + 35
y = 39
Maybe the second one is correct