A. 3(x + 2) = 18 B. X + 2 = 18
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The cost for a party here is the base fee, plus charges for any additional guests.
So we know for a 15-person party, the price is going to be $100. That's a flat (constant) cost.
We know that for each additional person, we add $12. So for
more people, the cost is $
.
Since 100 is constant here, we make that our y-intercept. Even with no additional guests, the cost is still $100.
We add to write
. 12 is the constant rate of change (slope).
So we know for a 15-person party, the price is going to be $100. That's a flat (constant) cost.
We know that for each additional person, we add $12. So for
Since 100 is constant here, we make that our y-intercept. Even with no additional guests, the cost is still $100.
We add to write