Given the system of equations. Which of the options represents the resulting equation after an equivalent expression for y is substituted into the second equation.
-4x+y=3
2x-y=12

a.2x - (4 x + 3) = 12
b.-4(4 y + ) + y = 3
c.2 (4 x + 3) - y
d.-4 x + 4 x - 3 = 3

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?

What is the inverse of the function f(x) = 2x + 1?

36x2 + 49y2 = 1,764 the foci are located at: (-√13, 0) and (√13,0) (0, -√13) and (0,√13) (-1, 0) and (1, 0)edit: the answer is (- the square root of 13, 0) and (the square root of 13, 0)