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Sergeu [11.5K]
3 years ago
7

7a-3y=(9-3y) how do you do this problem and what formula to use

Mathematics
1 answer:
stiv31 [10]3 years ago
3 0
There is no formula. Just basic Algebra.

Let's solve for y.

<span><span><span>7a</span>−<span>3y</span></span>=<span>9−<span>3y</span></span></span>Step 1: Add 3y to both sides.

<span><span><span><span>7a</span>−<span>3y</span></span>+<span>3y</span></span>=<span><span><span>−<span>3y</span></span>+9</span>+<span>3y</span></span></span><span><span>7a</span>=9

</span>Step 2: Add -7a to both sides.

<span><span><span>7a</span>+<span>−<span>7a</span></span></span>=<span>9+<span>−<span>7a</span></span></span></span><span>0=<span><span>−<span>7a</span></span>+9

</span></span>Step 3: Divide both sides by 0.

<span><span>00</span>=<span><span><span>−<span>7a</span></span>+9</span>0</span></span><span>y=<span><span><span>−<span>7a</span></span>+9</span>0

</span></span>Answer:

<span>y=<span><span><span>−<span>7a</span></span>+9</span><span>0</span></span></span>
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A scale drawing of a school bus has a scale of 1/2 inch to 5feet. If the length of the school bus is 4 1/2 inches on the scale d
Sedaia [141]
Answer: actual length = 45 ft

Explanation:

Scale drawn:

1/2 inch = 5ft

Meaning that if the drawing scale is 0.5 inch then the actual bus would be 5ft.

If the length of the drawn school bus is 4 1/2 inches. We can write:

1/2 = 5
4 1/2 = x

=> x = (5 x 4 1/2)/1/2
Or x = (5 x 4.5)/0.5
x = 22.5/0.5
x = 45

Therefore the actual length of the bus is 45 ft

3 0
3 years ago
The entrance hall in Black's family house has a perimeter of 71 2/3 ft.IF it is 9 2/5 ft wide, how long is it?
serious [3.7K]

Answer: 26 13/30 feet

Step-by-step explanation:

The hall is in the shape of a rectangle. The perimeter of a rectangle is:

= 2(length + width)

= 2l + 2w

Since perimeter = 71 2/3 ft and Width = 9 2/5 ft wide, the length will be calculated thus:

Perimeter = 2l + 2w

71⅔ = 2l + 2(9 2/5)

71 2/3 = 2l + (2 × 47/5)

71 2/3 = 2l + 94/5

71 2/3 = 2l + 18 4/5

Collect like terms

2l = 71 2/3 - 18 4/5

2l = 71 10/15 - 18 12/15

2l = 52 13/15

l = (52 13/15 ÷ 2)

l = 793/15 × 1/2

l = 793/30

l = 26 13/30

Therefore, the length is 26 13/30ft

3 0
3 years ago
Help me on my geometry hw it’s due in 25 minutes
icang [17]

Answer:

now just half the first triangals answers

Step-by-step explanation:

x =21

y=24

<u>TH</u>=24          <u>PQ</u>=12

<u>RH</u>=24          <u>NQ</u>=12

<u>RT</u>=21            <u>NP</u>=10.5

>T=80            >P=80

>H=20           >Q=20

>R=80           >N=80

8 0
3 years ago
Read 2 more answers
4x-2y=8(x-3) <br><br> x= ?<br> y= ?
Rainbow [258]

x = -6 y/2

y = -2x + 12

hope that helped

6 0
3 years ago
Please help.<br> Is algebra.<br> PLEASE HELP NO LINKS OR FILES
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Answer:

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Step-by-step explanation:

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