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Mekhanik [1.2K]
3 years ago
13

Find a solution to the following system of equations. -3x+3y=-9 -3x+y=7 PLZ help anyone

Mathematics
1 answer:
N76 [4]3 years ago
7 0

Answer:

Step-by-step explanation:

Ok. In order to answer this question, there are multiple ways in which we can approach this. The way I am going to do is substitution. Isolate the y in the second equation which gives you y=7+3x.

Now what you want to do is to plug in that equation into the first one.

-3x+3(7+3x)=-9.

-3x+21+9x=-9

6x=-30

x=-5,

Ok, now you need to solve the y variable.

So plug in the x variable into the second equation and solve for y.

y=-8

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How many pennies are in one-dollar??
OleMash [197]

Answer:

There are 100 pennies in one dollar.

Step-by-step explanation:

5 0
3 years ago
If EF=9x+14, FG=56, and EG=250, find the value of x.
nexus9112 [7]

Answer:

Value of x =20

Step-by-step explanation:

Given: EF = 9x+14 units , FG = 56 units and EG = 250 units.

Segment Addition Postulates states the following for 3 points that are collinear.

i.e, Let three points A, B and C are collinear and B is between A and C.

i,e AC = AB + BC

By Segment addition postulates; solve for x;

EG = EF + FG

Substitute the given values we get;

250 = 9x + 14 + 56

or

250 = 9x + 70

Subtract 70 on both sides we get;

250 -70 = 9x + 70 -70

Simplify:

180 = 9x

Divide both sides by 9 we get;

\frac{180}{9} = \frac{9x}{9}

Simplify:

x = 20

Therefore, the value of x =20


7 0
4 years ago
Read 2 more answers
Name a decimal between 0.4 and 0.5
Aliun [14]

To find a number between both decimals, what you can do is take the average of both numbers.

We have then:

average = \frac{0.4+0.5}{2}

Rewriting we have:

average = \frac{0.9}{2} \\average = 0.45

Therefore, the decimal obtained is a number between 0.4 and 0.5

Answer:

a decimal between 0.4 and 0.5 is:

average = 0.45

6 0
3 years ago
Read 2 more answers
A manufacturer of skis offered chain discounts of 10/5/4 to many of its customers. Joe Jones ordered skis that had a total list
kati45 [8]
First, 
149,500 * .10 = 14,950
149,500 - 14,950 = 134,550

then,
134,550 * .05 = 6727.50
134,550 - 6727 = 127,822.55 
127,822.50 * .04 = 5112.90

trade discount = 14950 + 6727.50 + 5112.90 
26790.40

hope this help

7 0
3 years ago
Read 2 more answers
Help can u answer this
umka21 [38]

Answer:

c) 82

d) - 11

g)27

h)1000

k)11

l) 8

Step-by-step explanation:

{9}^{2}  + 1  \\  = (9 \times 9) + 1 \\  = 81 + 1 \\  = 82

{6}^{2}  -  {5}^{2}  \\  = (6 \times 6) - (5 \times 5) \\  = 36 - 25 \\  =  - 11

(1 + 2 {)}^{3}  \\  =  {3}^{3}  \\  = 3 \times 3  \times 3\\  = 27

(2 + 8 {)}^{3}  \\  =  {10}^{3}  \\  = (10 \times 10 \times 10) \\  = 1000

\sqrt{4}  +  {3}^{2}  \\  = 2 +  {3}^{2}  \\  = 2 + (3 \times 3) \\  = 2 + 9 \\  = 11

2 \times 5 -  \sqrt{4}  \\  = 10 -  \sqrt{4}  \\  = 10 - 2 \\  = 8

<h3>Hope it is helpful....</h3>
3 0
3 years ago
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