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Sever21 [200]
4 years ago
15

3s + 9c = $75 8s + 5c = $67

Mathematics
2 answers:
otez555 [7]4 years ago
6 0

Answer:

s=4, c=7. (4, 7).

Step-by-step explanation:

3s+9c=75

8s+5c=67

----------------

simplify 3s+9c=75 into s+3c=25,

-------------------

s+3c=25

8s+5c=67

----------------

s=25-3c

8(25-3c)+5c=67

200-24c+5c=67

200-19c=67

19c=200-67

19c=133

c=133/19

c=7

s+3(7)=25

s+21=25

s=25-21

s=4

cestrela7 [59]4 years ago
3 0

Answer:

s=4& c=7

Step-by-step explanation:

3(4)+9(7)=$75

8(4)+5(7)=$67

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