- #1

- 141

- 0

Have I got this linear equation right?

8y - 31 = 13 - 3y

My answer is y = 8.8

8y - 31 = 13 - 3y

My answer is y = 8.8

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- Thread starter Gringo123
- Start date

- #1

- 141

- 0

Have I got this linear equation right?

8y - 31 = 13 - 3y

My answer is y = 8.8

8y - 31 = 13 - 3y

My answer is y = 8.8

- #2

- 1,179

- 5

Plug the value you got into the equation and check to see.

- #3

Mark44

Mentor

- 34,880

- 6,621

Your answer is incorrect. Show us how you got your solution and we can steer you in the right direction.Have I got this linear equation right?

8y - 31 = 13 - 3y

My answer is y = 8.8

- #4

HallsofIvy

Science Advisor

Homework Helper

- 41,833

- 963

But whenever you ask someone to check your answer, you should always show how you got it.

- #5

- 141

- 0

1st I added 31 to both sides which left me with:

8y = 44 + 3y

From this I could see that 44 = 5y (5y + 3y = 8y)

44 / 5 = 8.8

- #6

- 24

- 0

1st I added 31 to both sides which left me with:

8y = 44+3y

From this I could see that 44 = 5y (5y + 3y = 8y)

44 / 5 = 8.8

It should be "-" not "+".

Why did you change this sign?

- #7

- 141

- 0

8y - 31 = 13 - 3y

I added 31 to both sides:

8y = 44 - 3y

Then I add 3y to both sides:

11y = 44

and I get the right answer, y = 4

Iy was a silly little error on my part. Thanks everyone.

- #8

Mentallic

Homework Helper

- 3,798

- 94

Since you at first found y=8.8, this means if you plug that value in for y in the equation 8y-31=13-3y then you should find that the left-hand side equals the right-hand side. But this isn't true, which means you've made a mistake somewhere. Plugging in y=4 however will make both sides equal, which means you have found the correct value.

This can be for your quadratics as well.

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