If the pond were a rectangle, then:
length=15 m
width=6 m
We would have to calculate the perimeter of this rectangle.
Perimeter of a rectangle=2(length)+2(width)
Perimeter of this rectangle=2(15 m)+2(6 m)=30 m+12 m=42 m
We need 42 m and I only have 40 m, therefore, it would not be enough for fencing the pond.
X=6
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First use the slope formula to find the slope of -4. y2-y1/x2-x1 which looks like this: 9-(-7)/-1-3 = 16/-4 = -4. Now use that slope and one of the points to sub into the y = mx+b to solve for b and then use that b and your slope of -4 to rewrite the equation. I chose (-1,9) as my point to get 9=-4(-1)+b. Solve for b to get b = 5. Therefore, the equation of the line is y = -4x + 5