2. What is the first step in solving the linear S2x – 3y = 11
system
substitution method in the most efficient
way?
-x + 5y = -9 by the
a. Solve the first equation for x.
b. Solve the first equation for y.
c. Solve the second equation for x.
d. Solve the second equation for y.

What is the length of the unknown leg in the right triangle ?

1- 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. 2- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis. 3- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in part b?

Identify the number 127 as a rational or irrational. explain