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

Which of the following describes arteries? A. They have thick muscular walls. B. They usually contain valves. C. They carry blood towards the heart. D. They car
What causes a resting potential to develop in a neuron? A. Diffusion of sodium and potassium ions B. Active transport of sodium and potassium ions C. Active tra
In 2002, the United States had a GDP (Gross Domestic Product) of $10.5 trillion. What does that mean?
80% of what number is 24
what is 8.246 rounded to the nearest tenth
15 percent of what number is 12
the zeros of the function f(x)=(x+2)^2 - 25 are?
Which type or types of rock can become metamorphic rock? A. only sedimentary rocks B. metamorphic and igneous rocks C. igneous and sedimentary rocks D. igneous,
American fundamentalists opposed educators teaching (A) creationism (B) evolution (C) religion (D) civics
Which of these processes require mitosis? A. Embryological development B. Reducing surface area to volume ratio C. Maintaining cell size D. Cell growth