No they would be intersecting. x=-1 is a vertical line down the x axis on -1. y=2 is a horizontal line at 2 on the y axis.
XY
01
11
21
31
41
This will simply be a horizontal line at y = 1
Yes, one ounce is 28 grams.
Your sister is 10. So your brother is 4. (Your sister is 6 years older than your brother.) You are 12. (Your brother is 1/3 your age)
So: (10 - 6) * 3 = your age = 12