System A) x + 3y = -9 2x + y = 4

system B) 3x + 4y = -9
2x + y = 4

1) How can we get System B from System A?
Choose 1

a) Replace one equation with the sum/difference of both equations

b)Replace only the left-hand side of one equation with the sum/difference of the left-hand sides of both equations

c)Replace one equation with a multiple of itself

d) Replace one equation with a multiple of the other equation

2) based on the previous answer, are the systems equivalent? in other words, do they have the same solution?

A) yes

B) No​

oof

Step-by-step explanation:

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this