solve & check 6y-1 = 2y +2

goldiewomen1000

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Nov 16, 2008
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your right, that wasn't the whole prob...I have another...solve & check 6y-1 = 2y +2


6y-1 = 2y +2
-2y-1 = -2y+2
4y-1 = 2
4y+1= +1
4y = 3
4y/4 =3/4
y = 3/4

(6)3/4 = 9/2 (2)3/4 = 3/2
9/2-1 = 3/2+2
then?
 
I am having a very difficult time following this, but I think it's right. You are asked to solve

\(\displaystyle $6 y - 1 = 2 y + 2$\)

Just get y on one side, and do the same thing to both sides of the equation, until y is all by itself on that side. As soon as you get the variable you're solving for on a side by itself,

\(\displaystyle $4 y = 3$\)

\(\displaystyle $y = \frac{3}{4}$\)

you're done. So, stop solving, and plug your answer back in for the variable, to check your work:

\(\displaystyle $6 \cdot \frac{3}{4} - 1 = \frac{18}{4} - \frac{4}{4} = \frac{14}{4}$\)

and, the other side:

\(\displaystyle $2 \cdot \frac{3}{4} + 2 = \frac{6}{4} + \frac{8}{4} = \frac{14}{4}$\)

Now, since those two come out to the same thing, that means your answer's right. There is no "and then." If your answer were wrong, the original left-hand side of your equation would be NOT EQUAL to the original right-hand side of your equation.
 
goldiewomen1000 said:
your right, that wasn't the whole prob...I have another...solve & check 6y-1 = 2y +2


6y-1 = 2y +2
-2y-1 = -2y+2
4y-1 = 2
4y+1= +1
4y = 3
4y/4 =3/4
y = 3/4

(6)3/4 = 9/2 (2)3/4 = 3/2
9/2-1 = 3/2+2
then?


You found the right answer for y.

Now go back into your original equation, replace y with 3/4 and simplify.

You were given: 6y-1 = 2y +2

So, let y = 3/4

6(3/4) - 1 = 2(3/4) + 2

(9/2) - 1 = (3/2) + 2

7/2 = 7/2...It checks!!!

Since we got the same answer on both sides of the equation, then y = 3/4 is correct.

Now, chivox is right but 14/4 should have been reduced to 7/2.
 
goldiewomen1000 said:
9/2 - 1 = 3/2 + 2
then?
MidWood, it's clear that Goldie's only problem here is handling fractions.

9/2 - 1 = 9/2 - 2/2 = 7/2

3/2 + 2 = 3/2 + 4/2 = 7/2

Ok, Goldie?
 
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