3 years ago

Solve the system by substitution. 2x - y + z = -4 z = 5 -2x + 3y - z = -10

1 answer:

6 0

Substituting z = 5 into the first equation:

2x - y + 5 = -4
y = 2x + 9

Substituting y and z into the third equation
-2x + 3(2x + 9) - 5 = -10
4x + 27 = -5

x = -8
y = 2(-8) + 9 = 7
z = 5

You might be interested in

How would you get 32a^5?

Daniel [21]

Answer:

${( - 2a)}^{5}$

open the bracket:

$= ( - 2) {}^{5} (a) {}^{5} \\ \\ = - 32 {a}^{5}$

magnitude:

$| - 32 {a}^{5} | = 32 {a}^{5}$

4 0

3 years ago

Read 2 more answers

When a number has a positive and a negative root, the positive root is called?

gogolik [260]

Answer:

"principal root"

Step-by-step explanation:

The positive (even or odd) root of a positive real number is called its <em>principal root</em>.

When an odd root is taken of a negative real number, the negative real root is the principal root. That is -2 is the principal cube root of -8.

3 0

3 years ago

What is the difference between (-5)^2 and -5^2

Darya [45]

Answer:

Step-by-step explanation:

(-5)^2 - (-5^2)

25 - (-25)= 25 + 25 = 50

7 0

4 years ago

please help. i’ll give thanks and mark brainlist. have posted multiple times but no one can help:( it’s geometry!

Nastasia [14]

I’m not positive but the answer might be 240.34

3 0

3 years ago

Find the area of the shape

ella [17]

Answer:

the area of the shape is 8cm

7 0

3 years ago

Read 2 more answers