Solve for Y: Linear Equation 8y - 31 = 13 - 3y | Correct Answer Y = 8.8

[Gringo123]

Have I got this linear equation right?

8y - 31 = 13 - 3y

My answer is y = 8.8

 

[Gear300]

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

 

[Mark44]

Have I got this linear equation right?

8y - 31 = 13 - 3y

My answer is y = 8.8

Your answer is incorrect. Show us how you got your solution and we can steer you in the right direction.

 

[HallsofIvy]

Gringo123, I suspect you subtracted 3y from both sides when you should have added it.

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

 

[Gringo123]

Hi Mark. Thanks for helping me out... again!

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

 

[Sweet_GirL]

Hi Mark. Thanks for helping me out... again!

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?

 

[Gringo123]

Once again I've confused everyone with a typo. The original problem is:
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.

 

[Mentallic]

It's easier to check for yourself if you have the correct answer or not.

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.