08-08-2021
Mathematics

contestada

7x+2y=19
7x+8y=13
Please solve it by Simultaneous method

Respuesta :

ridmitharuka ridmitharuka

08-08-2021

Answer:

y=-1

x=3

Step-by-step explanation:

7x+2y=19-----(1)

7x+8y=13------(2)

(1)-(2)

(7x+2y)-(7x+8y)=19-13

7x+2y-7x-8y=6

+2y-8y=6

-6y=6

y=-1

by substitute in (1)

7x+2*(-1)=19

7x-2=19

7x=19+2

7x=21

x=21/3

x=3

Answer Link

Otras preguntas

1 Read the excerpt from Narrative of the Life of Frederick Douglass. Identify the tone in the following sentence. "How I escaped death, I do not know. There I w

helpppppppppppppppppp

The ratio of red marbles to blue marbles in a bag is 6:7. How many red marbles are there if there are 364 total marbles in the bag?

Nine hundred sixty seven divided by four with remander

To find simple interest, you multiply the principal (in dollars), the interest rate (as a decimal), and the time in years. The equation 22.80 = 300 •019•4 show

Jacob and his team start at the 45 yard line but they get a flag and have to go back 15 yards. The next play Jacob ran the ball 12 yards before getting tackled.

What is the total price of a $45.79 item when a 7% sales taxe is added

Find the value of x.

What is the slope of x+y=4

2. Why doesn't Frederick know his exact age?