How do you do subtracting fractions with unlike denominators

First of all to be able to subtract the fractions they must have same denominators.

1. Look for the LCD( least common denominator)

2. Re-write each equivalent fraction using the new denominators.

3. Now you could subtract the numerators and keeping the denominator the same.

it's d.

step-by-step explanation:

because: -1(4x + 1y) +2 (1x-3y) distribute each number into the parenthesis.

then you would get: -4x - 1y + 2x -6y combine like terms

and get: 2x -7y

hope my answer has you if not then i'm sorry.

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.