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3 years ago

What is the solution of the system? Use elimination.

2 answers:

5 0

Good morning Stacy

3x - 4y = -24
x + y = -1
We need to solve x + y = -1 for x
x = -1 - y( I transferred the y in the right side)
Substitute -y -1 for x in 3x -4y = -24
3x - 4y = -24
3(-y-1) -4y = -24
You just need to simplify
-7y -3 = -24
-7y = -24 + 3
-7y = -21
y= -21/-7
y= 3
Now substitute 3 for y in x= -y -1
x= -y-1
x = -3 -1
x= -4

Answer : x = -4 and y=3
The correct option is D

I hope that's help and if you have questions about my answer please ask. Thx

denis-greek [22]3 years ago

4 0

Eliminate y's
multiply second equaiton by 4
4x+4y=-4

add to first equation

3x-4y=-24
<u>4x+4y=-4 +</u>
7x+0y=-28

7x=-28
divide both sides by 7
x=-4
sub back

x+y=-1
-4+y=-1
add 4 to both sides
y=3

(x,y)
(-4,3)
D is answer

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2X minus one equals five

stepan [7]

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7 0

3 years ago

Read 2 more answers

What is the value of fraction 1 over 3x3 + 5.2y when x = 3 and y = 2?

Slav-nsk [51]

Hello from MrBillDoesMath!

Answer:

1/ 91.4

Discussion:

Evaluate 1/ ( 3x^3 + 5.2y) when x = 3, y = 2.

1/ (3 (3)^3 + 5.2(2)) =

1/ ( 3 * 27 + 10.4) =

1/ ( 81 + 10.4) =

1/ (91.4) =

.0109 (approx)

Thank you,

MrB

6 0

4 years ago

The circumference of the bike tire above is 83.524 inches. What is the radius of the bike tire? (Use 3.14 for .) A. 262.27 in B.

Shtirlitz [24]

Answer:

Option <u>C. 13.3 in</u>.

Step-by-step explanation:

Here's the required formula to find the radius of the bike tire :

$\longrightarrow{\pmb{\sf{C_{(Circle)} = 2\pi r}}}$

C = circumference
π = 3.14
r = radius

Substituting all the given values in the formula to find the radius of the bike tire :

$\begin{gathered} \qquad{\longrightarrow{\sf{C_{(Circle)} = 2\pi r}}} \\ \\ \qquad{\longrightarrow{\sf{83.524 = 2 \times 3.14 \times r}}} \\ \\ \qquad{\longrightarrow{\sf{83.524 = 6.28 \times r}}} \\ \\ \qquad{\longrightarrow{\sf{83.524 = 6.28r}}} \\ \\ \qquad{\longrightarrow{\sf{r = \frac{83.524}{6.28}}}} \\ \\ \qquad{\longrightarrow{\sf{r = 13.3 \: in}}} \\ \\ \qquad \star{\underline{\boxed{\sf{\red{r = 13.3 \: in}}}}}\end{gathered}$

Hence, the radius of bike tire is 13.3 inches.

$\rule{300}{2.5}$

6 0

2 years ago

Read 2 more answers

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cricket20 [7]

2.
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3.
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4.
$\frac{600g}{3kg}=\frac{600g}{3000g}=\frac{600g}{5\cdot600g}=\frac15$
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5.
$10^3+10^2+10+1=1000+100+10+1=1111$

6. $6.7\cdot5\$=33.5\$$

7.
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8.
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9.
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10.
48 minutes = 1 hour - 12 min
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11.
$34.1^oC-27.6^oC=6.5^oC$

12.
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13.
$12\cdot108=1296$

14.
$\overline{x}=\frac{8.2+9.4+3.5+2.9}4=\frac{24}4=6$

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3 years ago

The price of a liter of milk increased 10% compared with last year . If the new price is $1.21 per liter , what was last years p

Alex Ar [27]

Answer:

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Step-by-step explanation:

First take if 110% is equals to $1.21 what about 100%

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3 years ago