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earnstyle [38]
3 years ago
5

X-y+z=-7 x+y+z=1 x+y-z=9 How would you solve this equation?

Mathematics
1 answer:
SVEN [57.7K]3 years ago
3 0
X - y + z = -7
x + y + z = 1
-------------------add
2x + 2z = -6

x + y + z = 1
x + y - z = 9....multiply by -1
-------------------
x + y + z = 1
-x - y + z = -9 (result of multiplying by -1)
------------------add
2z = -8
z = -8/2
z = -4

2x + 2z = -6
2x + 2(-4) = -6
2x - 8 = -6
2x = -6 + 8
2x = 2
x = 1

x - y + z = -7
1 - y - 4 = -7
-y -3 = -7
-y = -7 + 3
-y = -4
y = 4

so x = 1, y = 4, and z = -4
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A 12-foot flagpole casts a nine-foot shadow. What is the measure from the top of the shadow to the top of the flag pole?
amm1812

Here is the answer OwO:

A 12-foot flagpole casts a nine-foot shadow. The measure from the top of the shadow to the top of the flag pole is 15.

Here is the explanation/work OwO:

<u><em>Switch sides.</em></u>

c^2=12^2+9^2

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c = 15

Therefore, your answer will be 15.

_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-

Sorry if I am late. Hope this helps!! ^^

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Answer:

The inequalitty S-178<=2,000

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Please help!!!!!!!!!!!!
Virty [35]

Answer:

yes they are inverserve of each other  

Step-by-step explanation:

f(x) = y just for say

y=3x+9

switch the x and y value and solve for y

x=3y+9

x-9=3y

(x-9)/3 = y

inverserve of f(x) is g(X)

and now g(x) = y

y= (x-9)/3

switch x and y and solve for y

x=(y-9)/3

3x= y-9

3x+ 9 = y

inverserve of g(x) is f(X)

7 0
3 years ago
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