threeee threeee
  • 10-09-2020
  • Mathematics
contestada

7x - 4y = -30
3x + 4y = 10
Solve by elimination

Respuesta :

Аноним Аноним
  • 12-09-2020
  • Answer:

x = - 2

y = 4

  • Step-by-step explanation:

7x - 4y = -30

3x + 4y = 10

add

7x + 3x - 4y + 4y = - 30 + 10

10x = - 20

x = - 20 : 10

x = - 10

replace x

3(-2) + 4y = 10

- 6 + 4y = 10

4y = 10 + 6

4y = 16

y = 16 : 4

y = 4

Answer Link

Otras preguntas

Aaron is 5 years younger than Ron. Four years later, Ron will be twice as old as Aaron. Find their present ages
Question 9 Unsaved Use the distributive property to rewrite the expression –5(3x – 2). Question 9 options: –15x – 10 –15x – 2 –15x + 10 –15x + 2
In 2000, the population of Littletown was 17,000. Assuming a doubling time of 26 years, predict the population in 2010, rounded to the nearest thousand
Which choices are solutions to the following equation? X^2-3x=-5/4 A=x=2 B=x=2.5 C=x=-1 D=x=0.5
Identify the sentence that contains a dependent clause. A. My sister is old enough to visit the city by herself. B. In my American literature​ class, we rea
2/3 + 3/4 = ????????????????
Why is the capillary fringe of the zone of aeration similar to a plant’s roots? They draw up water. There is nothing similar about them. They are both found in
Plzzz help ASAP thank u
One watt is equal to which of these values? 1 joule/hour 1 joule-hour 1 joule/second 1 joule-second
Denotative and Connotative Synonyms Neither Antonyms