If (a+b) / (x−y) = 3/5 then (10a + 10b) / (9x−9y) = ?

2/3

Step-by-step explanation:

Look at what you are getting on the right hand question. 10a +10b has a common factor that can be pulled out. It is 10

10a + 10b = 10(a + b)

Now look at the denominator

9x - 9y = 9(x -y)

There are a lot of possible answers.

Mine would be to multiply 3/5 * 10/9

so

(10a + 10b)/(9x - 9y) = 2/3

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.

-7/8

step-by-step explanation:

instead of subtracting you add the -6/8 and -1/8