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Rus_ich [418]
3 years ago
12

The sum of twice a number and 13 is 75 • but in an algebraic equation DONT SOLVE

Mathematics
1 answer:
Alchen [17]3 years ago
5 0

Answer:

I won't solve it, because you asked me to.

Step-by-step explanation:

The first question we should ask ourselves is "what are we looking to solve?"

We are looking for some sort of value that satisfies that equation. We'll call it x

Reading from left to right:

The sum of twice a number and 13 is 75

         +            2              x              13 = 75

2x + 13 = 75

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Solve the below system of equations using the best method. Please describe the method used [substitution, graphing, elimination,
Veseljchak [2.6K]
1). Since you have -2y and 4y, elimination is easy to do for solving for x..
Keep the first equation and multiply the second equation by 2. Then add.

5x - 2y = -1
8x + 4y = 56

10x - 4y = -2
8x + 4y = 56
-----------------
18x       = 54

x = 3

Now we can use substitution to solve for y.
Substitute 3 for x in the first original equation and solve for y.

5x - 2y = -1

5(3) - 2y = -1

15 - 2y = -1

-2y = -16

y = 8

(3, 8)


2.)

3x - y = =16
-4x - y = 21

Multiply both sides of the first equation by -1 to change all signs. Then when you add the equations, you eliminate y and solve for x.

-3x + y = 16
-4x - y = 21
-----------------
-7x       = 37

x = -37/7

Now multiply the first original equation by 4 and the second original by 3 to eliminate x and solve for y.

 12x - 4y = -64
-12x - 3y =  63
---------------------
         -7y   = -1

y = 1/7

Solution: (-37/7, 1/7)
4 0
3 years ago
Can someone help me with this i got the question wrong the first time so its not 7.50
Sedaia [141]

Answer: $7.6502

Step-by-step explanation:

Grape cost $1.19 per pound. 3.16 pounds are bought. The total amount paid for grape will be:

= $1.19 × 3.16

= $3.7604

Peaches cost $1.29 per pound. 1.35 pounds are bought. The total amount paid for peaches will be:

= $1.29 × 1.35

= $1.7415

Peers cost $0.99 per pound. 2.17 pounds are bought. The total amount paid for pears will be:

= $0.99 × 2.17

= $2.1483

Total bill paid will be:

= $3.7604 + $1.7415 + $2.1483

= $7.6502

4 0
3 years ago
Question 3 of 56
Mumz [18]

Answer:

only B

Step-by-step explanation:

since A) its 180+6 which absolutely greater than 9

C)31-1=30 which is greater than 8

D) 4 is greater than 3

4 0
2 years ago
(12) Find the value of x. The diagram is not to scale.
EastWind [94]

Answer:

c = 64

Step-by-step explanation:

7 0
3 years ago
What are Domain, Ranges, and Functions?​
Murrr4er [49]

Answer:

The domain of a function f(x) is the set of all values for which the function is defined, and the range of the function is the set of all values that f takes. (In grammar school, you probably called the domain the replacement set and the range the solution set.

Step-by-step explanation:

4 0
3 years ago
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