Answer:
72
Step-by-step explanation:
Given that 2x + 3y = 12 , then
(2x + 3y)² = 12² = 144 ← distribute left side using FOIL
4x² + 12xy + 9y² = 144 ( subtract 12xy from both sides )
4x² + 9y² = 144 - 12xy = 144 - 12(6) = 144 - 72 = 72
The first thing you should know for this case is that the perimeter of a rectangle is defined as:
P = 2L + 2W
Where
L = length
W = Wide
We then have to clear the length:
L = (P-2W) / 2
Substituting the values
L = ((6x-6) -2x) / 2
Rewriting:
L = ((3x-3) -x)
L = 2x-3
Answer:
the length is
2x-3
Answer:
A) (0,0)
Step-by-step explanation:
1.) graph the equation, 3x+2y = x+y
2.) the line intersects (0,0) on the coordinate plane
Answer:
n = -1
Step-by-step explanation:
1 - 8n - 8 = -7n - 6n - 12
Simplify
-8n - 7 = -13n - 12
Add 7 to both sides
-8n = -13n - 5
Add 13n to both sides
5n = -5
Divide both sides by 5
n = -1
