Answer:
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Step-by-step explanation:
=
<u><em>Explanation:-</em></u>
Given that
The answer is 6
Same as plane surfaces on a regular cuboid
12
y-y1=m(x-x1)
y-3=5(x+4)
y-3=5x+20
y-5x+3+20=0
y-5x+23=0