Question

I don’t understand!!

Answer 1

-1/2y + 3

Explanation:

group like terms:

2/5y - 9/10y - 4 + 7

factor out y:

y (2/5 - 9/10) - 4 + 7

add the numbers:

y (2/5 - 9/10) + 3

simplify:

y (-1/2) + 3

= -1/2y + 3