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Nostrana [21]
3 years ago
13

Y=7x+3 7x-6y=-18 substitution

Mathematics
2 answers:
Lynna [10]3 years ago
6 0

Answer:

x=0

y=3

Step-by-step explanation:

y =7x+3       equation 1

7x-6y=-18   equation 2

using equation 1 in equation 2 we have:

7x-6(7x+3)= -18

7x -42x -18 = -18

-35x -18 = -18

-35x = -18 +18

-35x=0

x=0

so we have:

y =7x+3  

y= 7(0) +3

y = 3

Andre45 [30]3 years ago
3 0

Answer:

y=3

x=0

Step-by-step explanation:

we have the following system of equations:

y=7x+3\\7x-6y=-18

the substitution method requires that we take one of the variables of one equation, and substitute that value in the other equation.

in this case taking advantage of the fact that in the first equation the value of y is already cleared, we substitute it in the second equation:

7x-6(7x+3)=-18

and then we solve for x:

7x-42x-18=-18\\-35x-18=-18\\-35x=-18+18\\-35x=0\\x=0

and since x=0 substituting this into the first equation of the system to find the value of y:

y=7(0)+3\\y=3

the answer is y=3 and x=0

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lapo4ka [179]

Answer:

P( top two horses are predicted incorrectly in incorrect order)

= \frac{1}{2}

Step-by-step explanation:

In the horse race the outcome can be predicted in 5! = 120 ways.

Now suppose the top two horses were predicted incorrectly in incorrect order. Now, the  top horse can be predicted incorrectly in 4 ways.

Suppose the top horse was predicted to be in k-th position where k = 2, 3 ,4,5

so the second horse can be predicted to be in place from 1 to (k - 1)

So, the top two horses can be predicted  incorrectly in incorrect order

in \sum_{k =2}^{5}(k - 1) = 10 ways  

and for each prediction of the two the remaining horses may be predicted in 3! = 6 ways.

Hence ,

P( top two horses are predicted incorrectly in incorrect order)

= \frac{6 \times 10}{120}

=\frac{1}{2}

 

8 0
2 years ago
The students at a High School earned money for an international animal rescue foundation. 82 seniors earned an average $26.75 pe
Anon25 [30]

Answer: A. $16.13

Step-by-step explanation:

Total students = 82+74+96+99 =351

Sum of earnings of 82 seniors  = $26.75  x 82= $2193.5

Sum of earnings of 74 juniors  = $12.25 x 74 = $906.5

Sum of earnings of 96 sophomores  = $15.50  x 96 = $1488

Sum of earnings of 99 freshmen  =  $10.85 x 99 = $1074.15

Total earnings =  $2193.5  + $906.5+  $1488 +$1074.15

= $5662.15

(Total earnings) ÷ (Total students )

= $5662.15÷ 351

= $16.13

4 0
3 years ago
Plz help i serouisly need help I will reward with one hundred points
Mekhanik [1.2K]

Percent increase is

100(new/old - 1)

Here that's

100(26/22 - 1) = 200/11 ≈ 18.2

Answer: third choice

6 0
3 years ago
Read 2 more answers
What regular polygon has an interior angle of 156 degrees
icang [17]

Answer:

regular pentadecagon

Step-by-step explanation:

it has 15 sides

that is what matches the exterior angled sum property - 360degree

let me explain it

1 side = 180 - 156 = 24

360/24 = 15

mark me brainliest and thank me if you like the answer

4 0
2 years ago
Cal has 3 black pens and 7 blue pens. What is the ratio of the number of black pens she has to the number of blue pens she has?
monitta

Answer:

3/7 or 3 to 7 both are the same ratio.

Step-by-step explanation:

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