Question

Simplify the expression.
2/5y−4+7−9/10y =

Answer 1

`(1)/(2)` y +3

Explanation:

You want to combine like terms

`(2)/(5)` y and
`(-9)/(10)` y are like terms because they both have a variable y

-4 and + 7 are like terms because they are both constants. (numbers without letters)

We combine these

`(4)/(10)` means the same as
`(2)/(5)` I just multiplied the numerator (top) and the denominator (bottom) by 2. I did this so that I could add it to
`(-9)/(10)`

`(4)/(10)`y -
`(9)/(10)`y =
`(-5)/(10)` y (4-9 = -5) or
`(-1)/(2)` y simplified

-4 + 7 = 3