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Hello.  I dont know how to change this formula to find the original one (y = mx+b).I...

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adrienvillez | Student, Undergraduate | eNoter

Posted September 21, 2013 at 9:05 PM via web

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Hello.  I dont know how to change this formula to find the original one (y = mx+b).

I have to find the slope and the y-intercept.

I do not want you to give the answer, I need help to be able to do that on my own.

I also have to trace the line after... that should be ok!

Thank you!

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Tagged with algebra, formula, line, math, y = mx+b

4 Answers | Add Yours

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baxthum8 | High School Teacher | (Level 3) Associate Educator

Posted September 21, 2013 at 9:25 PM (Answer #1)

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Solve: `-6y - x - 18 = 0`   for y.

In order to solve for y we most move everything to the right of the equal sign.  We do this by "undoing" the operation.

First, add 18 to both sides.  When we do this, (-18 + 18) on left will make 0.  This gives:

`-6y - x = 18` Next we will add x to both sides to "undo" the minus x.  Just like the 18 on previous step.  This gives:

`-6y = x + 18` Finally, we will divide all terms by -6, as -6/-6 will make just 1y.  This gives:

`(-6y)/-6 = x/-6 + 18/(-6)`

``Simplify everything to give:

`y = -1/6x - 3`

Now that it is written as y = mx + b we can identify slope and y-intercept.

m - slope = `-1/6`

b - y-intercept = `-3`

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adrienvillez | Student , Undergraduate | eNoter

Posted September 21, 2013 at 10:17 PM (Answer #2)

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oh great! thank you!

It looks so simple when we have the answer...

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adrienvillez | Student , Undergraduate | eNoter

Posted September 22, 2013 at 1:32 AM (Answer #3)

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This time, I have to put the correct y = mx+b form into the asnwer box, check if the numbers are part of a Linear (or input N if not).

there are ALWAYS those 2 that im wrong.  I tried 10 time.

because b is 0 or 0.00, it gives me wrong.

also, itsnt like f(g) or f(x) its a capital Letter.  I expect the formula will be different...

Im clueless.  i dont know what to do.  thank you!

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atyourservice | Student , Grade 10 | eNoter

Posted March 17, 2014 at 8:22 PM (Answer #4)

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`-6y-x-18=0`

since it is telling you to solve for y you move all the other numbers to the right by adding the opposite for example: the opposite of -9 would be +9 and the opposite of x would be -x

`-6y=x+18`

to get y by itself you need to divide by -6 as it is the number in front of x

`(-6y)/(-6) = x/(-6) + (18)/(-6)`

simplify:

`y=-1/6x-3`

so the slope will be -1/6 and the y intercerpt= -3

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