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3 years ago

What is the value of y when x = 6? -3x + 9y = 18

Mathematics

2 answers:

tiny-mole [99]3 years ago

8 0

Answer:

y=4

Step-by-step explanation:

We are given the expression:

$-3x+9y=18$

We want to find $y$ when $x$ equals 6. Therefore, we can plug 6 in for x.

$-3(6)+9y=18$

Now, let's begin solving for y. First, multiply -3 and 6.

$-18+9y=18$

Next, add 18 to both sides of the equation. We add because 18 is negative and addition will cancel out the -18 on the left.

$-18+18+9y=18+18$

$9y=18+18$

$9y=36$

Finally, divide both sides by 9. We divide because y is being multiplied by 9, and division is the inverse of multiplication.

$9y/9=36/9$

$y=36/9$

$y=4$

When x=6 in the equation, y is equal to 4.

CaHeK987 [17]3 years ago

5 0

Hey there! I'm happy to help!

Let's plug in our x value.

-3(6)+9y=18

-18+9y=18

We add 18 to both sides.

9y=36

We divide both sides by 9.

y=4

Have a wonderful day! :D

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Reduce To Simplest Form.<br><br>2/2 + 1.75 - 44/25 =

Soloha48 [4]

Answer/Step-by-step explanation:

First, we should make each fraction, decimal, whole number into fraction and number form.

So, 2/2 = 1.

1.75 is 1 3/4.

44/25 is 1 19/25.

Now we have our equation, now we can do this equation easier.

1 + 1 3/4 - 1 19/25.

1 + 1 3/4 = 2 3/4.

Then, we turn both numbers to Decimal Form.

2 3/4 = 2.75

1 19/25 = 1.76.

When we divide 19 by 25, we get 0.76.

Then we subtract the decimals.

We should start right and end left.

5 - 6 = -1, we need to borrow one from the closest digit to the left, which is 7. Now we have 15 - 6 = 9.

Next, we have 6 - 7 = -1, we need to borrow one from the closest digit to the left, which is 2. Now we have 16 - 7 = 9.

Our answer right now is 0.99.

Lastly, 1 - 1 = 0.

Which leaves us with the answer: 0.99 (Zero and Ninety Nine Hundredths.)

Best of Luck to you.

If you have any questions, feel free to comment below.

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3 years ago

A car traveled 180 miles at a constant rate. Write an equation that would

Mnenie [13.5K]

Answer:

180/t = r

Step-by-step explanation:

In this question, we would have to write an equation that represents the scenario given.

We know that the car traveled 180 miles at a constant rate.

We would use the y = mx + b format for the equation, but replacing the variables with "r" and "t"

We know that 180 will be our y-variable, since that would be the base of the equation:

180 = ???

And to find how long/fast it will take the car, we would need to multiply the rate of speed "r" and time "t" in order to get our distance.

Plug it into the equation:

180 = rt

With this set up, you can find the rate of speed of the car when you know the time.

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180/t = r

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Dafna1 [17]

$53.46 would be the cost of a package with 18 slices of cheese! Hope this helped! Mark if correct!

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3 years ago

Read 2 more answers

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Step-by-step explanation:

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