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C. (-3, -3) and (-3, 3)

Step-by-step explanation:

slope = (difference in y)/(difference in x)

If the two x-coordinates are equal, then the difference in x is zero.

Division by zero is undefined, so if the two points have the same x-coordinate, then there is an undefined slope.

C. (-3, -3) and (-3, 3)

C has undefined slope

Step-by-step explanation:

Slope = (Y2-Y1) / X2-X1

=(3-(-3)) / (-3-(-3))

= (3+3) / (-3+3)

= 6/0

=undefined

the answer is c. 23/3

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.