Answer: 
Step-by-step explanation:
If a line is passing through the point (a,b) and has a slope m, then the equation of the line in point-slope form is given by :-

Given: A line that includes the point (6, 1) has a slope of 9.
The equation of line in point-slope form: 
Hence, the required equation in point slope form: 
Let's call Lyndale L and Jack J
L = J - 27
Jack has 80 fish so Lyndale has
L = 80 - 27
L = 53
Lyndale has 53 fishes.
No an equilateral triangle has three 60° angles it has no right (90°) angle. A right angled triangle can be an isosceles triangle but not an equilateral one.