The perimeter is 72 and P=2(L+W), furthermore, L=2W so altogether...
2(L+W)=72 and using L=2W in this we have:
2(2W+W)=72
3W=36
W=12 and since L=2W
L=24
So the length is 24cm and the width is 12cm.
what does the solution mean? check the picture below.
Answer:
Area of triangle B is 112 cm²
Option A is correct option.
Step-by-step explanation:
The dimensions of triangle B are twice the dimensions of triangle A.
Area of triangle A = 28 cm²
We need to find area of triangle B
We know that if base = b and height = h for triangle A
The area of triangle A will be:
The dimensions for triangle B will be:
Putting in formula we get:
SO, we get
We have Area_A = 28 cm²
Area of triangle B Area _B is:
So, Area of triangle B is 112 cm²
Option A is correct option.
9514 1404 393
Answer:
(x, y) = (-1, 5/2)
Step-by-step explanation:
The only variable with a coefficient that has a magnitude of 1 is x in the first equation. Using that equation, we can write an expression for x:
x = 2y -6
This can be substituted for x in the second equation.
(7/2)(2y -6) +7y = 14
7y -21 +7y = 14 . . . . . . eliminate parentheses
14y = 35 . . . . . . . . . . . add 21
y = 35/14 = 5/2 . . . . . divide by the coefficient of y
x = 2(5/2) -6 = -1
The solution is (x, y) = (-1, 5/2).