Asked by Bob
On Chatty Cathy’s cell phone plan she pays for minutes used plus a fixed monthly charge. For 500 minutes she pays $35 total, and for 1500 minutes used she pays $55 total.
What is her monthly fixed charge?
A) $15
B) $20
C) $25
D) $30
What is her monthly fixed charge?
A) $15
B) $20
C) $25
D) $30
Answers
Answered by
Steve
y = mx+b, so
500m+b = 35
1500m+b = 55
so,
1500m+3b = 105
1500m+b = 55
2b = 50
b = 25
500m+b = 35
1500m+b = 55
so,
1500m+3b = 105
1500m+b = 55
2b = 50
b = 25
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