3 senhoras foram a feira. dona nice gastou R$25,00 em 3 duzias de laranjas e 4 duzias de bananas, dona maria comprou 4 duzias de laranjas e 3 duzias de bananas, e neusa gastou R$20,00 em 5 duzias de bananas

POR FAVOR ME AJUDEM PRECISO DISSO PARA DIA 27

Part 1) The price of each dozen of oranges is R$3.00 and the price of each dozen of bananas is R$4.00

Part 2)

Step-by-step explanation:

The complete question in English is

3 ladies went to the fair. Ms. Nice spent R$25.00 on 3 dozen oranges and 4 dozen bananas, Ms. Maria bought 4 dozen oranges and 3 dozen bananas, and Ms Neusa spent R$20.00 on 5 dozen bananas.

Part 1) Find the price of each dozen of bananas and each dozen of oranges

Part 2) How much did Mrs. Maria spend?

Part 1) Find the price of each dozen of bananas and each dozen of oranges

Let

x ----> the price of each dozen of oranges

y ----> the price of each dozen of bananas

we know that

Ms. Nice

----> equation A

Ms. Maria

Ms. Neusa

----> equation B

step 1

Find the value of y

Solve equation B

Divide by 5 both sides

step 2

Substitute the value of y in the equation A

solve for x

subtract 16 both sides

divide by 3 both sides

therefore

The price of each dozen of oranges is R$3.00 and the price of each dozen of bananas is R$4.00

Part 2) How much did Mrs. Maria spend?

we know that

Ms. Maria

substitute the value of x and the value of y  in the expression above

starting with:    

5 + x - 12 = 2x - 7   

5 + x - 12 - x = 2x - 7 - x (subtract x from both sides)   

5 - 12 = x - 7 (combine and cancel x's from both sides)   

5 - 12 + 7 = x - 7 + 7 (add 7 to both sides)   

0 = x (add numbers together on both sides)       

so in order for the equation to be true, x must be 0.   

trying x = -0.5   

5 + x - 12 = 2x - 7 (original equation)   

5 + -0.5 - 12 = 2(-0.5) - 7 (plug in value of x)   

5 + -0.5 - 12 = -1 - 7 (did multiplication)   

-7.5 = -8 (did addition on both sides)       

since -7.5 is obviously not equal to -8, the value of -0.5 for x is wrong.   

trying x = 0   

5 + x - 12 = 2x - 7 (original equation)   

5 + 0 - 12 = 2(0) - 7 (plug in value of x)   

5 + 0 - 12 = 0 - 7 (did multiplication)   

-7 = -7 (did addition on both sides)       

since -7 equals -7, that demonstrates that the value of 0 for x is correct.   

trying x = 1   

5 + x - 12 = 2x - 7 (original equation)   

5 + 1 - 12 = 2(1) - 7 (plug in value of x)   

5 + 1 - 12 = 2 - 7 (did multiplication)   

-6 = -5 (did addition on both sides)       

since -6 is obviously not equal to -5, the value of 1 for x is wrong.

the car was traveling 40 mph before it started skidding. ( 2 points ) 17. was the driver were her brakes working at 75% efficiency or better? ( 2 points ) yes 29.

step-by-step explanation: