thoresener
contestada

Two cooks purchased plates and cups at the same store. The first cook bought 4 plates and 5 cups for a total of $25.25. The second cook bought 7 plates and 3 cups for a total of $25.50. What is the price of a plate?

Respuesta :

PHDFlopper
x=number of plates
y=number of cups

4x+5y=25.25

7x+3y=25.50

Add the two equations together:

11x+8y=50.75
11x=50.75-8y

x=[tex] \frac{50.75-8y}{11} [/tex]

Plug x into the first equation:
4x+5y=25.25

4( [tex] \frac{50.75-8y}{11} [/tex] ) = 25.25 

[tex] \frac{4(50.75-8y)}{11} [/tex] = 25.25

[tex] \frac{203-32y}{11} [/tex] = 25.25

203-32y = 277.75

-32y=74.75
32y=-74.45
y=2.34 (rounded to nearest hundredth)

The price of a plate is $2.34

Otras preguntas