Question

If z + 4 = 3z and 3 - y = -7, what is the value of xy

1. 20
2. -40
3. 40
4. -20

Answer 1

Are you sure you copied of the Q correctly? There is no x

Answer 2

20

Explanation:

z + 4 = 3z

z - 3z = - 4

- 2z = - 4

z = - 4 / - 2

z = 2

3 - y = - 7

- y = - 7 - 3

- y = - 10

y = - 10

xy

= 2 * 10

= 20