Answer:
390 m (perpendicular to river) x 780 m (parallel to river)
Step-by-step explanation:
Let y be the length of the side parallel to the river, and let x be the length of the sides perpendicular to the river.
The total area and length of fence required are given by:
Rewriting the length of fence as a function of only x:
The value of x for which the derivate of L(x) is zero is the length of x that uses the least amount of fencing:
If x = 390 m, then:
The dimensions that will use the least amount of fencing are 390 m x 780 m
1. x=−y+8−z
2.x=−7−4y−5z (everything over 4)
3.x=2−z
1.y=-x+8-z
1.z=-x+4-y
2.y=7+4x-5x (everything over 4)
2.z=7+4x-4y (everything over 5)
3.z=2-x
Answer:
x=2 and y=3
Step-by-step explanation:
This is a system of equations that you would solve by substitution.
Start by solving for x by plugging in the value of y:
x + 2(x+1) = 8,
Then simplify:
3x = 6 / x = 2
Now plug the known value of x into the first equation:
y = (2) + 1
Simplify,
y = 2
I hope this helps!
First, we need to isolate the variable x.
To isolate x, we simply need to multiply both sides by 9, which would result in x = 9