Question

PLEASE HELP I DONT UNDERSTAND

Answer 1

-1/2y +3

Explanation:

You want to simplify the expression 2/5y -4 +7 -9/10y.

Simplification

Here, the meaning of "simplify the expression" is "combine like terms."

It can be helpful to group like terms:

`=\left((2)/(5)-(9)/(10)\right)y +(-4+7)`

The fractions are combined in the usual way, using a common denominator. Then the result is reduced to lowest terms.

`=\left((4-9)/(10)\right)x+3=-(5)/(10)x+3\\\\=\boxed{-(1)/(2)x+3}`