Question

2b.....3p.....19dollars
4b.....2p.....26 dollars
How much does a banana cost ? And a pineapple

Answer 1

Hello Emma!

The question:
"How much does a banana cost? And a pineapple?"

2b.....3p.....19dollars (1)

4b.....2p.....26 dollars (2)

(1) * 2 => 4b + 6p = 38 dollars
(1) - (2) => 0b + 4p = 12 dollars

=>p = 3

=> 2b + 9 = 19 dollars
=> 2b = 10 dollars

=> b = 5 dollars

Answer 2

Răspuns:

1 banana costs 5$

1 pineapple costs 3$

Explicație pas cu pas:

2b.....3p.....19dollars  We multiply by 2 this relation  ⇒

4b.....2p.....26 dollars

4b.....6p.....38 dollars  From this new relation we will deduct the second relation   ⇒  4b.....6p.....38 dollars

                    4b.....2p.....26 dollars  ⇒4b-4b ...6p-2p ....38$-26$  ⇒4p...12$ ⇒1p=3$  Now we go back to the first relation and replace the number of pineapples with their value in order to calculate the price for bananas  

2b.....3p.....19dollars   ⇒2b...9$....19$   ⇒2b=19$-9$  ⇒2b=10$  ⇒1b=5$