3 (3/1) represents the slope and -4 is the y-intercept
6 divides into 78 which gives a quotient of 13.
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2 square 6 this is because 24 goes into 4 and 6 and 4 goes into 2 twice
Lines are perpendicular if the slope of one is the negative reciprocal of the other. In this case the slopes are -8/3 and 8/3, so while negative they are not reciprocal. So no, the two lines intersect but are not perpendicular.
Let the missing % be x.
Now, according to your question ;
5 = x% of 25
5 = x / 100 * 25
thus, 25x = 500
Thus, x = 500/25
= 20
Thus, 5 is 20% of 25.