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enyata [817]
3 years ago
8

how to solve quations using subsitution. The equation I need to solve is 2x+y=5 -3x+2y=17 please explain it in detail thank you

Mathematics
1 answer:
faust18 [17]3 years ago
3 0
We have a system of 2 linear equations with 2 unknown, so we can solve it:
<span> 2x + y = 5
-3x + 2y = 17 
We'll use substitution, so lets solve for y in the first equation and substitute that in the second afterwards:
y = 5 - 2x
</span>-3x + 2(5 - 2x) = 17 
-3x + 10 - 4x = 17
-7x = 7
x = -1
then substitute in the original equation to find y:
<span>y = 5 - 2x = 5 - 2(-1)
</span>= 5 + 2
y = 7
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Someone please help me!!
Phoenix [80]

Answer:

x=6

UV=40

WV=40

UW=30

Step-by-step explanation:

GIVEN UV=WV

6X+4=40

X=6

NOW PUT X=6 in WV AND UW

6 0
3 years ago
Lupita bought 7 pounds of pretzels at a local wholesaler for $16.80. Her friend Charles bought 5 pounds of pretzels at the super
Galina-37 [17]

Answer:

Charly has the better buy

Step-by-step explanation:

The unit cost is

=16.8/7

=$2.4

Her friend Charles bought 5 pounds of pretzels at the supermarket for $12.75

Unit cost

=12.75/5

=$2.55

Charly got the best deal because the unit cost per item is less than that of the friend

3 0
3 years ago
Given |u| = 2.5, |v| = 3.2, and the angle between the vectors is 60°, find the value of u · v?
Alenkasestr [34]

Step-by-step explanation:

u.v=|u||v|cos60°

u.v=(2.5)(3.2)(1/2)

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4 0
4 years ago
A six sided die is rolled 4 times. find the probability that a 2 or 3 is rolled at least once. round your answer to two decimal
goblinko [34]

The probability that a 2 or 3 is rolled at least once is 0.14.

<h3>Probability of not rolling a 2 or 3 in a single die roll of two dice</h3>

when a six die is rolled once there is 11/12 probability of not rolling 2 or 3.

rolling a six sided die two times, p(2 or 3)' = 11/12

rolling a six sided die four times, p(2 or 3)'  = (11/12)² = 121/144

the probability that a 2 or 3 is rolled at least once is calculated as follows;

P = 1 - p(2 or 3)'

P = 1 - 121/144

P = 20/144

P = 0.14

Thus, the probability that a 2 or 3 is rolled at least once is 0.14.

Learn more about probability here: brainly.com/question/24756209

#SPJ4

4 0
2 years ago
16 POINTS!!! HELP ASAP
nadya68 [22]

Answer:

The answer is 358.01

Step-by-step explanation:

Given:

3\times 10^{2}+5\times 10^{1}+8\times 10^{0}+1\times \frac{1}{10^{2}}

Now, to solve first we crack the power notation then multiply and then do the addition:

3\times 100+5\times 10+8\times 1+1\times \frac{1}{100}

(The value of 10^{1} is 10 and the value of 10^{0} is 1.)

=300+50+8+\frac{1}{100}

=300+50+8+0.01

=358.01.

Therefore, the answer is 358.01 .

7 0
3 years ago
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