Amy and julie are arguing about a math problem. amy thinks (12, -5) is a solution to the equation 3x – 3y = 21. julie does not think it is a solution. who do you agree with and why?

step-by-step explanation:

we have

using a graphing tool

see the attached figure

this is a quadratic equation (vertical parabola) open up

the vertex is a > vertex

the domain of the function is all real > interval (-∞,∞)

the range of the function is the > [-6.125,∞)

the function has two x->   and

the function is increasing over the > (0.25,∞)

the function is decreasing over the > (-∞,0.25)

explanation:

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