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Naya [18.7K]
3 years ago
8

Solve the system of linear equations by substitution. 2x-y=3 x+5y=14

Mathematics
1 answer:
adoni [48]3 years ago
4 0
Let 2x – y = 3 ——— equation 1

Let x + 5y = 14 ——— equation 2

Making x the subject in eqn 1, = x = y + 3 / 2 ——— eqn 3

• Put eqn 3 in eqn 2

(y + 3 / 2) + 5y = 14

6y = 14 – 3/2

6y = 25/2

y = 25/12

• put y = 25/12 in eqn 3

x = (25/12 + 3/2)

x = 43/12
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Answer:

Either B or D.

Step-by-step explanation:

I consider both options valid. It all depends on how the employer is keeping track of time, ie if the pay "ticks" every 60 minutes, or an employee is allowed to clock in half hours.

Will I be able to work 30 and a half hour for example? If I'm allowed to, D.

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6 0
3 years ago
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the volume of a prism changes from 20 to 540 after a dilation. What was the scale factor of the dilation?
pashok25 [27]
Hello!

You find what they did between the prisms by dividing the second prism by the first prism

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Hope this helps!
5 0
3 years ago
John has 1/3 as much money as grant. Grant gives John 9$. Now grant has 6$ more than John. How much money do grant and John have
anastassius [24]

Answer:

48 dollars

Step-by-step explanation:

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5 0
3 years ago
A stackable CD rack holds 20 CDs and costs $3. Mark has a collection of 120 CDs. How much will it cost him to buy enough racks t
elixir [45]

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5 0
3 years ago
Find ϴ in the equation sin(ϴ + 15) = cos(2ϴ)<br><br> a. 50<br> b. 75<br> c. 25<br> d. 40
4vir4ik [10]
The answer is <span>c. 25
</span> 
<span>sin(ϴ + 15) = cos(2ϴ)
</span>sin(ϴ + 15) =sin(25 + 15) =<span>sin(40) =0.64
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</span> so <span>ϴ=25</span>
8 0
3 years ago
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