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WILL GIVE BRAINLIEST. Lizzy’s cell phone plan charges 5 cents per message for in-network text messages and 10 cents per message for out-of-network text messages. If she sent a total of 1500 messages and her bill was $80, how many out-of-network messages did she send?

Respuesta :

jamaestas05
Answer: 800
.10cents x 800text messages = 80dollars

Answer:

in-network texts = 1400

out-of-networks texts = 100

Step-by-step explanation:

a=in-network text

b=out-of-network text

a+b=1500

a=-b+1500

since we know that a=-b+1500, we substitute that into

0.05a+0.1b=80

so that it is

0.05(-b+1500)+0.1b=80

0.05b+75=80

b=100

since b=100, we substitute that into

a+b=1500

so that it's

a+100=1500

a=1500-100

a=1400

b=100

hope this helps