Question

Sam can not read a part of this homework problem.

-7y + 5(3 + __ y)

Sam knows the expression simplifies to 3y + 15. What number belongs on the blank line in the homework problem?

Answer 1

A. -4
B. 2
C. 4
D. 10

Answer 2

Thanks for the answers

Answer 3

What does it equal to

Answer 4

I don't know. -.-

Answer 5

-7y + 5(3 + __ y)

-7y + 5(3 + n*y)

-7y + 15 + 5ny

(-7y + 5ny) + 15

(-7+5n)y + 15

This expression is equal to 3y + 15, so

(-7+5n)y + 15 = 3y + 15

(-7+5n)y = 3y

-7 + 5n = 3

keep going to solve for n