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mr Goodwill [35]
2 years ago
13

I don't know how to use elimination without getting decimals when I divide to get like x's or y's The equation for elimination i

s -4x-2y=14 -10x+7y=-25
Mathematics
1 answer:
k0ka [10]2 years ago
7 0

Answer:

x=-1, y=-5

Step-by-step explanation:

To solve these simultaneously using elimination

-4x-2y=14 ....(I)

-10x+7y=-25 ......(ii)

The first step is to ensure that the coefficients of one of the variables(x or y) are the same.

This is done by multiplying with an appropriate number.

Let's say we want to eliminate y in the equations above,

Multiply equation (I) all through by 7 to get:

-28x-14y=98

Multiply equation (II) all through by 2 to get:

-20x+14y=-50

-28x-14y=98

-20x+14y=-50

Since the coefficient of y are the same (14), we can now eliminate.

We add the two equations because 14 has different Signs.

-48x=48

x=-1

Substitute x=-1 in equation (I) to get y.

-4x-2y=14

-4(-1)-2y=14

4-2y=14

-2y=14-4

-2y=10

y=-5

Therefore x=-1, y=-5

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Vera_Pavlovna [14]
<span>Let x = represent the number of weeks of deposits
A = 120 + 5x the account balance after x weeks
The account balance is directly proportional to the number of weeks of deposits if:
A/x = constant
(120 + 5x)/x = 120/x + 5 is not a constant
For example:
After 1 week there will be: 120 + 1*5 = $125 on the account
After 2 week there will be: 120 + 2*5 = $130 on the account
After 3 week there will be: 120 + 3*5 = $135 on the account
But 125/1 <> 130/2 <> 135/3
The account balance is not proportional to the number of weeks of deposits.</span>
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3 years ago
What is the measure of angle DOC, given that AB is congruent to DC
pickupchik [31]

Answer:

D. 65 degrees

Step-by-step explanation:

If two sides are congruent the corresponding angles are also congruent

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3 years ago
Tina is saving to buy a notebook computer. She has two options. The first option is to put $500 away initially and save $10 ever
Alexxandr [17]

Answer:

Tina would save the same amount using either option after 20 months.

With either option, Tina would save $700.

Step-by-step explanation:

This problem can be modeled by a first order equation:

Where Tina's saved money after n months is:

S(n) = S(0) + rn, where S(0) is the money put away initially and r is how much she saves every month.

The first option is to put $500 away initially and save $10 every month, so:

S_{1}(n) = 500 + 10n

The second option is to put $100 away initially and save $30 every month, so:

S_{2}(n) = 100 + 30n

After how many months would Tina save the same amount using either option?

It will happen at the month n in which S_{1}(n) = S_{2}(n), so:

S_{1}(n) = S_{2}(n)

500 + 10n = 100 + 30n

500 - 100 = 30 - 10n

400 = 20n

20n = 400

n = \frac{400}{20}

n = 20.

Tina would save the same amount using either option after 20 months.

How much would she save with either option?

We can choose S_{1}(20) or S_{2}(20), since they are equal

S_{1}(20) = 500 + 10(20) = 500 + 200 = 700

With either option, Tina would save $700.

3 0
3 years ago
suppose that the population of a deer in state is 1500 and is growing 2% each year. predict the population after 4 years
aleksklad [387]
1500*2%=30
30*4=120
1500+120+1720
1720 deer in 4 years
4 0
3 years ago
I’m having a hard time finding the answer, any help is appreciated (:
kogti [31]

Answer:

True.

Step-by-step explanation:

It fails the vertical line test. The vertical line test checks to see if any inputs (x values) have more than one output. In this case, they do.

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