She multiplied it by 5, because that would make the equation:
2.5 + y = 125
So when we add -y and y cancel out
Answer: Each candy costs and each drink costs
Step-by-step explanation:
We are told Dominic bought 2 drinks and 5 candies, costing a total of :
(1)
Then, we are told Colton bought 8 drinks and 7 candies, costing a total of :
(2)
Now we have a system with two equations ans two unknowns. Let's solve it:
Multiplying (1) by -4:
(3)
Summing (2) and (3):
(4)
Isolating :
(5) This is the cost of each candy
Substituting (5) in (1):
(6)
Isolating :
(7) This is the cost of each drink
<span>y + (–6) = –9
+6 + 6
simplify
y = -3
answer
y = -3</span>