Show and explain how replacing one equation by the sum of that equation and a multiple of the other produces
a system with the same solutions as the one shown.
8x + 7y = 39
4x- 14y = -68
Just wanna know

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?

Bernice paid $162 in interest on a loan of $1800 borrowed at 6%. how long did it take her to pay the loan off?

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?