zenobia1985 zenobia1985
  • 17-10-2021
  • Mathematics
contestada

Solve using substitution x+y+2z=-7 / -5z=25 / 3x-3y-6z=3

Respuesta :

anasweeney43 anasweeney43
  • 17-10-2021

Answer:

x = -3

y = 6

z = -5

Step-by-step explanation:

A) x + y + 2z = -7

B) -5z = 25

C) 3x - 3y - 6z = 3

B) -5z = 25

z = 25/-5

(z = -5)

A) x + y + 2(-5) = -7

x + y = -7 + 10

x + y = 3

(x = 3 - y)

C) 3x - 3y + 6(-5) = 3

3x - 3y + 30 = 3

3x - 3y = -30-3

3x - 3y = - 27

C) 3 (3-y) - 3y + 30 = 3

9 - 3y - 3y+ 30 = 3

-6y + 39 = 3

-6y = -39 + 3

y = -36/-6

(y = 6)

x + 6 = 3

x = 3 -6

(x = -3)

Answer Link

Otras preguntas

how do I divide 30 divided bt 7230​
For a field trip 25 students rode in cars and the rest filled eight busses. How many students were in each bus if 321 students were on the trip? 15 POINTS
Explain the effects of the exercizes on your health-related components
1. What would be five rather concrete details that make this excerpt from Tolkien's Fellowship of the Ring particularly vivid? In other words, Tolkien is know
How do I solve this?
Factor completely 4x4 − 24x3 + 36x2. A) 4x2(x − 3)2 B) 4(x − 3)2 C) 4x2(x + 3)(x − 3) D) 4x(x2 − 6x + 9)
What percent of the volunteers was at least 15 years old but no more than 24 years old?
Evaluate each expression for the given values: When a = 2,  b = 5 and c = -3 substitute and solve7c  + -2c  +c(A.) 18(B.) -18(C.) -11c(D.) 12​
what is the answer????
Which statement about Grant Wood's paintings is true? They are nonrepresentational artworks. They show famous people and cities from Iowa. They are examples of