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cestrela7 [59]
3 years ago
7

What does c=2.5b+70 c=5b+60 equal

Mathematics
2 answers:
anzhelika [568]3 years ago
4 0

Answer:

c=80  b=4

Step-by-step explanation:

c=2.5b+70               multiply the top equation by -2

c=5b+60

c=-5b+-140

c=5b+60                 add both equations together

c=80

plug in 80 for c to determine b for 1 equation.

(let's pick the second equation since it is easier to deal with whole numbers)

80=5b+60                          subtract 60 from both sides

20=5b                            divide each side by 5

4=b

sladkih [1.3K]3 years ago
4 0
C=80 and D=4
Yw have a nice day:)
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