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natita [175]
3 years ago
7

Use substitution to solve each system of equations. 4x – 5y = –7 y = 5x

Mathematics
2 answers:
Komok [63]3 years ago
8 0
Refer to answers in the picture.

sweet [91]3 years ago
3 0
4x - 5(5x)= -7
4x - 25x = -7
-21x = -7
x = 1/3

y = 5(1/3)
y = 5/3
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kondaur [170]

1.0915 x 10{9} <----Exponet

7 0
3 years ago
FIND THE SUM:<br> (6x^2-2x-3)+(x^2-3x+1)<br><br> 1.6x^2+6x+3<br> 2.7x^2+5x+2<br> 3.7x^2-5x-2
Butoxors [25]

8x^2-5x-2

method

open bracket

6x^2-2x-3+x^2-3x+1

collect like terms

6x^2+2x^2-3-3x+1

8x^2-3-3x+1

again collect like terms

8x^2-2x-3x-3+1

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5 0
3 years ago
Which formula best expresses your monthly ending balance?
igor_vitrenko [27]
Withdrawals must be subtracted from the beginning balance since to withdraw means to take out, so withdrawing money would lower the balance.
Deposits are added to the balance, so they must be added in the equation.

The answer is <span>c) Beginning Balance - Withdrawals + Deposits = Ending Balance</span>
4 0
3 years ago
A company finds that if they price their product at $ 35, they can sell 225 items of it. For every dollar increase in the price,
Basile [38]

Answer:

Maximum revenue = $8000

The price that will guarantee the maximum revenue is $40

Step-by-step explanation:

Given that:

Price of product = $35

Total sale of items = 225

For every dollar increase in the price, the number of items sold will decrease by 5.

The total cost of item sold = 225 ×35

The total cost of item sold = 7875

If c should be the dollar unit in price increment;

Therefore; the cost function is : [35+c(1)][225-5(c)]

For maximum revenue;

\dfrac{d}{dc}(cost \ function) =0

\dfrac{d}{dc}[[35+c(1)][225-5(c)]]=0

0+225-35× 5 -10c = 0

225 - 175  =10c

50 = 10c

c = 50/10

c = 5

Maximum revenue = [35+c(1)][225-5(c)]

Maximum revenue = [35+5(1)][225-5(5)]

Maximum revenue = (35 + 5)(225-25)

Maximum revenue = (40 )(200)

Maximum revenue = $8000

The price that will guarantee the maximum revenue is :

=(35 +c)

= 35 + 5

= $40

8 0
3 years ago
Is 3(2a - b) and 6a - 3b equivalent?
alina1380 [7]
Use the distributive property.
3*2a - 3*b = 6a - 3b.
3 0
3 years ago
Read 2 more answers
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