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oee [108]
2 years ago
15

25 POINTS!!!! PLEASE EXPLAIN TO ME STEP BY STEP!

Mathematics
2 answers:
Harman [31]2 years ago
8 0
-x-y-z=-8
-x-y-z=-8

Let's solve for x.<span><span><span><span>−x</span>−y</span>−z</span>=<span>−8
</span></span>Step 1: Add y to both sides.<span><span><span><span><span>−x</span>−y</span>−z</span>+y</span>=<span><span>−8</span>+y</span></span><span><span><span>−x</span>−z</span>=<span>y−8
</span></span>Step 2: Add z to both sides.<span><span><span><span>−x</span>−z</span>+z</span>=<span><span>y−8</span>+z</span></span><span><span>−x</span>=<span><span>y+z</span>−8
</span></span>Step 3: Divide both sides by -1.<span><span><span>−x</span><span>−1</span></span>=<span><span><span>y+z</span>−8</span><span>−1</span></span></span><span>x=<span><span><span>−y</span>−z</span>+8
</span></span>Answer: <span>x=<span><span><span>−y</span>−z</span>+<span>8</span></span></span>
Feliz [49]2 years ago
3 0
Easy peassy
so basically what you would try to do is eliminate one type of variable from 2 different equations
look, we have
2x+2z=4
that already has y eliminated
so we just need to eliminate y from another equation

so

we can eliminate the y from the 2nd equation
multiply the first equation by 4 and add to 2nd equation

-4x-4y-4z=-32
<u>-4x+4y+5z=7 +</u>
-8x-0y+1z=-25

-8x+z=-25


we have
-8x+z=-25 and
2x+2z=4

we can elminate the z's
multiply first (top) equation by -2 and add to bottom equaton
16x-2z=50
<u>2x+2z=4 +</u>
18x=54

18x=54
divide both sides by 18
x=3

sub back
2x+2z=4
2(3)+2z=4
6+2z=4
minus 6 both sides
2z=-2
divide 2
z=-1

sub back

-x-y-z=-8
-3-y-(-1)=-8
-3-y+1=-8
-2-y=-8
add 2 to both sides
-y=-6
times -1
y=6


x=3
y=6
z=-1
(x,y,z)
(3,6,-1)
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Lilly made a 89 on her Math test. The test had 26 questions, how many questions did she miss?
anygoal [31]
She missed 3 questions, 


11/100 equals x/26 
^set up this proportion 
you get 286 equals 100x
and x equals 2.86

round this to 3 questions

to check your work, do 23/26 
6 0
3 years ago
Paid $1,000 in interest on a loan of $10,000 for a
Lorico [155]

Answer:

R = 2 % per annum.

Step-by-step explanation:

SI = (P*T*R) /100

$1000 = ($10000 * 5 yrs *Rate) /100

4 0
3 years ago
The Mendes family bought a new house 8 years ago $129,000. The new house is now worth $186,000. Assuming a steady rate of growth
USPshnik [31]
So assuming simplet interest

find the change to find the interest
change=186000-129000=57000

simple interest=time times rate times principal
time is in years (8)
rate is in decimal
principal is amount invested (129000)

so
interest is 57000
57000=(8)(r)(129000)
57000=1032000r
divide both sides by 1032000
0.05523255813953488372093023255814=r
or
5.523255813953488372093023255814%
rounded
5.5%
3 0
3 years ago
Hugh bought some magazines that cost $3.95 each and some books thst cost $8.95 each he spent a total of $47.65 if Hugh bough 3 m
Arisa [49]

<u>Find amount spent on magazines:</u>

1 magazine = $3.95

3 magazines = $3.95 x 3 = $11.85


<u>Find amount spent on books:</u>

Amount spent on books = $47.65 - $11.85 = $35.80


<u>Find number of books:</u>

Number of books = $35.80 ÷ $8.95 = 4


Answer: Huge bought 4 books



4 0
3 years ago
Find the value of each variable in the following parallelograms.​
Stella [2.4K]

Answer:

x = 15

y = 7.5

Step-by-step explanation:

✔️Diagonals of a parallelogram bisect each other at 90°.

Therefore,

2x° + 60° + 90° = 180° (sum of triangle)

Solve for x

2x + 150 = 180

2x = 180 - 150

2x = 30

2x/2 = 30/2

x = 15

✔️2x = 4y (alternate angles/corresponding angles)

Plug in the value of x

2(15) = 4y

30 = 4y

30/4 = y

7.5 = y

y = 7.5

7 0
3 years ago
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