Answer:
12
y

Explanation:
When you multiply numbers with variable terms, each term has to be multiplied by like terms.
3
y× 4×y

Separate the terms.
3 ·
· y × 4 · x ·

Group the like terms and then multiply them.
( 3 x 4 ) (
x
) (
x
)
12 ·
·

12


Hoped this helped :)