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i have 3 questions for math

1. two lines have the given equations. use the linear combination method to solve.

2x-y=1

3x-y=-6

2. solve the system of equations using the substitution method

4x+2y = 10

y = 4x + 2

3. solve the system of equations using any method

6x – y = 2

y = 3x + 4

with work

1- 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.2- 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 the first question?

2/3(-6y+9x) expand each expression using the distributive property

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.