If you mean: a= 21w + 21h + 2wh
then
you subtract 21w and 21h from both side.
here will look like: a - 21w - 21h= 2wh
then divide 2w from each side
look like this: a - 21w - 21h / 2w = 2w/h
answer is a - 21w - 21h / 2w = h
Answer:
A = 16
Step-by-step explanation:
Formula b*h/2
b =8
h =4
so
A= 8*4/2
A = 16
Answer:
x=3
Step-by-step explanation:
Sorry I don't know I'm not that good at these kinds of things so so so sorry
To solve this equation by elimination, what you would do is multiply one of the equations by -1, or distribute -1 to each term in the equation, any of the 2 equations. Then align the equations and add them together.
-(X + 3y = 3)
-X - 3y = -3
-X - 3y = -3
X + 6y = 3
__________
3y = 0
y = 0/3 = 0.
Now we can solve for x, by simply plugging the value of y into any of the 2 equations.
X + 6y = 3
X + 6(0) = 3
X + 0 = 3
X = 3.
The solution to your system of equations would be (3,0).
Check this by plugging in the point to the other equation and see if it is true.
X + 3y = 3
(3) + 3(0) = 3
3 + 0 = 3
3 = 3.
Thus it is the solution.
