Question

When x + y = 30 and x < 13, which of the following must be true?

y = 30
y > 17
y = 17
y < 17
y > 30

Answer 1

y>17

Explanation:

x+y=30

x<13

What + 13 is 30?

17. So if x+y=30. Because x will be less than 13, y must make up the differnce by being greater than 17.

Ex: x=12

y+12=30

y=18

18 is greater than 17.

This is a great way to check because if your not sure, it elimates the other options!

Hope this helps!

Answer 2

y>17

Explanation:

`x + y = 30 \\ 13 + y = 30 \\ y = 17 \\ for \: x < 13 \\ y > 17`