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ch4aika [34]
3 years ago
5

Solve the system by substitution 5x+3y=8 3x+y=8

Mathematics
2 answers:
Doss [256]3 years ago
8 0

First you'd have to eliminate one of the variables, so which I used y. So to get rid of y, you need to multiply the whole equation, 3x+y=8, by 3. Which then you get 9x+3y=24.

On the second equation, it's stays the same. 5x+3y=8, except you chane the value of the number, so if it's positive change it to negative and vice versa.

So now you have -5x-3y=-8 and 9x+3y=24.

9x + 3y =24

-5x - 3y = 8

if you combine the terms, you'll see y is removed from the equation 3y-3y=0.

You're left with 4x=16, which x is 4.

Now you can substitute 4 for x to find y. Just use one of the equations to do this to, try 3x+y=8.

3(4)+y=8.

12+y=8

y=-4.

If you need the answer to be in a point form, it's (4,-4)


Olenka [21]3 years ago
7 0
There you go, hope that this helps

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Zoe is a salesperson who sells computers at an electronics store. She is paid a 1% commission for every computer sale she makes,
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<u>Given:</u>

Zoe gets paid a 1% commission for every sale she makes in addition to base pay.

She sold $8,000 worth of computers on a day and made $140 that day.

<u>To find:</u>

A function P(x) representing total pay on a day where she sells x dollars worth of computers.

<u>Solution:</u>

To determine the function P(x) we need to determine how much Zoe's base pay per day is.

One day, she sold $8,000 worth of computers and made $140 that day.

She gets a commission of 1% for $8,000.

1% of $8,000 = \frac{1}{100} (8,000) = 80.

So she got paid $140 out of which $80 was a commission.

So her base pay = 140-80 = 60.

So Zoe's base pay is $60 a day.

P(x) is the sum of her base pay and 1% of the amount of computer sales she makes ($x).

So P(x) = 60 + (0.01)x, where x is the computer sales she makes in dollars. P(x) is represented in dollars.

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Answer:

Step-by-step explanation:

hello :

if x1 and x2 this zero for ax²+bx+c  you have : x1 = 1 /x2  means :x1 × x2 =1

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