11-03-2020
Mathematics

contestada

What is the value of x and y if 21x+7y=42 and -5x+5y=10 are equal

Respuesta :

dannielle dannielle

11-03-2020

Answer:

-5x/5 +5y/5=10/5=2

y-x=2

y=x+2

21x+7*(x+2)=42

21x+7x+14=42

28x=42-14

28x=28

x=1

y=1+2

y=3

Step-by-step explanation:

Answer Link

Otras preguntas

Verbs that describe pizza

What is the theme of Ylla By Ray Bradburdy Please provide specific evidence from the story to support your answer. Include a page number and a direct quote from

In general, you expect the platform of a political party to. A. Lead to a national convention. B. Guide the political issues of the party's candidate. C. Consis

Because travel was safe and Rome built good roads, Christians were enabled to spread the gospel more easily. True False True is my answer.... Is this correct?

Stage directions are read aloud on stage by characters. Please select the best answer from the choices provided T F

Astronomy can best be described as a/an A. study of objects pertaining to the interior part of the Earth. B. study of objects beyond the Earth's atmosphere.

A teacher makes the analogy that stem cell research did for medicine what the Internet did for communication. What is meant by this analogy?

Lebensraum was the term Hitler used that meant a. a dream of German domination of all Europe. b. a dream of German domination of the Soviet Union. c. more po

Choose the adjective clause that best completes the sentence below. The movie ________________________ was intriguing. a. who we saw last month c. that saw las

Tumors secrete chemical signals that cause blood vessels from the circulatory system to grow into the tumor, providing nutrients. What is this called? Select on