For what amount of calling do the two plans cost the same?
What is the cost when the two plans cost the same?
A phone company offers two monthly plans. Plan A costs 18 plus an additional 0.08 for each minute of calls. Plan B has no initial fee but costs 0.12 for each minute of calls.
y = .10 x + 18
y = .08 x + 22
the same y when
.08 x + 22 = .10 x + 18
.02 x = 4
x = 4/.02 = 200 minutes
now go back and use either original equation to get y, the cost
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