Answer:
a = 4.8
Step-by-step explanation:
9 - 4a + 12 = 6a - 27
21 - 4a = 6a - 27
48 - 4a = 6a
48 = 10a
4.8 = a
y-4=3(x+3)
y-4=3x+9
y-4+4=3x+9+4
y=3x+13
Answer (C) 50 degrees
Steps: please check the attached image for details
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