A+B=25.6
A+C=41.6
B+D=25.6
C-D=19.2

Solve for A, B, C, and D.

Step-by-step explanation:

Let's get some organization going here and number the equations:

1. A+B=25.6

2. A+C=41.6

3. B+D=25.6 and

4. C-D=19.2

First I am going to solve equation 1 to get new equation 5:

5. B=25.6-A (hold that for a sec) and then solve equation 2 to get new equation 6:

6. C=41.6-A

Now sub equation 5 into equation 3:

25.6-A+D=25.6 and

A-D=0 so

A=D. That's good. Now we move on:

Sub equation 6 into equation 4 to get

41.6-A-D=19.2. But since A = D:

41.6-D-D=19.2 so

41.6-2D=19.2 and

-2D=-22.4 so

D = 11.2 and so does A.

Now we will fill in to get B and C.

In equation 2, with A = 11.2:

11.2+C=41.6 so

C = 30.4.

For B, use the fact that D = 11.2 in equation 3:

B+11.2=25.6 so

B = 14.4

All in all:

A = 11.2

B = 14.4

C = 30.4

D = 11.2

Yikes!!

a line is an defined derm because it

a)contains an infinite number of points b) can be used to create other geometric shapes c)describes something that does not have width or depth d) is a term that does not have a formal definition. a line is an undefined term because it: contains an infinite number of points.