I am very stupid, can someone help me out on this one?

How many solutions are there for the following system of equations?
y =(1/3)x + 2
3y – x = 6

F. 1
G. None
H. infinitely many
J. cannot be determined.

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.

Ahiker stands at an unknown elevation before he ascends 2 miles up a mountain to an elevation of 9 miles. find the elevation of the hiker before his ascent.

What is the sum of these mixed numbers 4 2/3+ 3 1/9