John and 2 friends are going out for pizza for lunch. They split one pizza and 3 large drinks. The pizza cost $14.00. After using a $7.00 gift certificate, they spent a total of $12.10. Write an equation to model this situation , and find the cost of one large drink.

(a) 3d+$14.00 - $7.00=$12.10;$1.70
(b) 3d+$14.00 - $7.00=$12.10;$1.90
(c) 3d-$14.00 + $7.00=$12.10;$9.55
(d) 2d+$14.00-$7.00=$12.10;$2.55

Question

John and 2 friends are going out for pizza for lunch. They split one pizza and 3 large drinks. The pizza cost $14.00. After using a $7.00 gift certificate, they spent a total of $12.10. Write an equation to model this situation , and find the cost of one large drink.

(a) 3d+$14.00 - $7.00=$12.10;$1.70
(b) 3d+$14.00 - $7.00=$12.10;$1.90
(c) 3d-$14.00 + $7.00=$12.10;$9.55
(d) 2d+$14.00-$7.00=$12.10;$2.55

anonymous · Answer

A. 
3d + $14.00 – $7.00 = $12.10; $1.70 

the pizza costs 14$ so they spend 7$ for the pizza (14$-7$, the gift certificate). If they spend 12.10$ total, that means they spent 5.10$ on drinks, because 7$ from those 12.1$ they had to give for the pizza. 
so, the 3 drinks cost 5.1$ which means that one drink costs 5.1/3...1.7$