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9966 [12]
2 years ago
6

What two numbers have a sum of -7 and a difference of 14?

Mathematics
2 answers:
tankabanditka [31]2 years ago
8 0
The first number, x, is 3.5. The other number, y, is 10.5.
X+y=-7
X-y=14.
Those are the two equations. If you use the elimination method, and add those two equations together, the resulting equation is 2x=7. That means the first variable is 3.5. So, 3.5-y=-7, so that means y is -10.5. If you plug that in with the other equation then it comes out as true.
Ksivusya [100]2 years ago
7 0

Answer:

The sum of two numbers is 14 and their difference is 10

Step-by-step explanation:

"2 numbers (x and y)

x+y = 14

and x-y + 10

If you each equation by positive 2, one gets 2x+2y = 28 and 2x-2y = 20

The 'y-terms' cancel out or equal zero when adding, so 4x = 48, divide by 4 on each side and x or the first number equals 12.

Plug 12 back into the equation for 'x' and subtract 12 on both sides so that y=2

The difference of 12-2=10 and the addition of 12 and 2 equals 14"

hopes this helps

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Does the order in which you add two integers with the same sign affect the sum
kondor19780726 [428]
If you add positive 5 and positive 5, you'll get positive 10.
If you add positive 5 and negative 5, you'll get positive 0.
If you add negative 5 and negative 5, you'll get negative 10.

-5 + 5 = -5 + 5
5 + 5 = 5 + 5
- 5 + -5 = -5 + -5

Does that help your question?
6 0
3 years ago
Where y=5x-7 and -3x-2y=-12 Write your answer as x,y
Mariulka [41]

Answer:

(x,y) = (2,3)

Step-by-step explanation:

y=5x-7                  (i)

-3x-2y= -12          

-(3x+2y)= -12

3x+2y= 12            (ii)

By putting the value of y from (i) in (ii)

3x+2(5x-7)=12

3x+10x-14=12

13x=12+14

13x= 26

x = \frac{26}{13}

x= 2

By putting the value of x in (i)

y= 5(2)-7

y= 10-7

y= 3

(x,y) = (2,3)

5 0
3 years ago
The shoe store's clerks are paid on commission. If the clerk receives a 12% commission on total purchase amounts before tax is a
aev [14]

Answer:

a) 37 + 42 =79

=7/100 x 79

=553/100

=5.53

Isaac's total bill = 79 + 5.53 = $84.53

b) 25/100 x 79

= 19.75

= 79 - 19.75

= $59.25 (before tax)

7/100 x 59.25

= 414.75/100

= 4.15

= 59.25 + 4.15

= $63.4 (after adding tax)

First we have to take out the percentage of discount and minus it from the total cost . To find the discounted price with tax, we have to take out the percentage of the tax from the discounted amount and add it to the discounted amount to get the total cost.

3 0
3 years ago
I need help with this please
Evgesh-ka [11]
Answer:

3) 0 ≤ y ≤ 100
7 0
3 years ago
Write the equation of a line that passes through the point (-1,5) and has a slope of -7. Your answer should be given in the form
Marysya12 [62]
Plug the values in the equation and find b
(x, y) and m = slope
5 = ( - 7)( - 1) + b \\ b =  - 2 \\ y =  - 7x - 2
4 0
3 years ago
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