Answer:
k = 3
Step-by-step explanation:
The slope-intercept equation of a str. line is y = mx + b.
In this particular case, m = 12, so we have y = 12x + b
Comparing this to the given y = 4kx + b
we see that 12 must = 4k, and thus k = 3
angle = 72°
complement = 18°
x = (90-x) / 4
cross-multiply to get:
4x = 90 - x
5x = 90
x = 18
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