Which expressions, when evaluated with y = - 7, are positive in value?

Choose all answers that are correct.

a. 18 + 2y

b. - 3y + (-17)

c. - 2y - 23

d. - 30 - 4y

It can be more than answer

If you replace y with - 7 you get:

a. 18 + 2x-7

b. - 3x-7 + (-17)

c. (-2x-7) - 23

d. - 30-4x-7

you get:

a. 18-14

b. 21-17

c. 14-23

d. - 30+28

this solves to:

a. 4

b. 4

c. - 9

d. - 2

so the positive answers are a and b