Question

How do you do y- 2/5 =4/9

Answer 1

You isolate the unknown in this case y in one side of the equal sign and work the numbers.

y= 4/9+2/5=5•4+2•9/5•9= 20+18/45=38/45

Answer 2

Make equal denominators.

9*5=45

2/5=

5*9=45

2*9=18

4/9=

9*5=45
4*5=20

y-18/45=20/45

Add 18/45 to both sides.

y= 38/45 <- the simplest form


I hope this helps!
~kaikers