There would be no roots since the graph has no x-intercepts.
78 = -2(m + 3) + m
78 = -2m - 6 + m
78 = -m - 6 |add 6 to both sides
84 = -m
m = -84
Answer:
Slope (m) = 
Step-by-step explanation:
Use the following equation:
Slope 
Let:

Plug in the corresponding numbers to the corresponding variables:

Simplify. Divide common factors from both the numerator and denominator:

is your answer.
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Linear. They all follow the format y=mx+c wether or not they have been rearranged.