Arthur S. answered • 08/28/12

Math, Science, Chemistry, and Computer Tutor

Mitze,

If the equation is (z+7)/8 = (z+8)/9 it does have a solution!

First we multiply each side by 9 to get

9(z+7)/8 = z+8

then we multiply each side by 8 to get

9(z+7) = 8(z+8)

simplify

9z + 63 = 8z +64

subtract 8z form each side to get

z + 63 = 64 and finalyy subtract 63 from each side

z= 64-63=1

so z= 1

Plug it back in the original equation

(z+7)/8 = (z+8)/9

so

(1+7)/8 = (1+8)/9

and

8/8 = 9/9 = 1

so z=1

Hope that helps!

Art

Adam K.

Indeed, it depends on the location of the parentheses! I am glad you included this possiblity. Mitze, take a second look at the problem and make sure to use the correct response we tutors have for you. Let us know if you need any more help!

08/28/12

Arthur S.

Hey Adam look above just below the green font and you will see that the problem is stated differently than what is depicted in the green font.

08/28/12

Adam K.

Oh! I see that now, thanks!

I also now see that WyzAnt needs an equation editor because it looks like students have to use the underline option to make fractions and then use the space bar to move numbers into the denominator. They may already have this idea, but I plan on giving them
this input.

08/28/12

Arthur S.

Adam,

Great Idea!

Art

08/29/12