ABC Bookstore sells packages of books that include both new and used books. New books cost $20 and used books cost $8. The books
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Answer:
Given information: WY=ZX, A is the midpoint of WY and A is the midpoint of ZX.
To prove : WA =ZA
Proof:
A is the midpoint of WY, it means A divides WY in two equal parts.
So, WY is twice of WA.
.... (1)
A is the midpoint of ZX, it means A divides ZX in two equal parts.
So, ZX is twice of ZA.
... (2)
(Given)
Substitute the values from equation (1) and (2).
Divide both sides by 2.
Hence proved.
Write the system in augmented-matrix form:
Multiply through row 1 by 1/2:
Add -1(row 1) to row 3, and add -5(row 1) to row 2:
Swap rows 2 and 3:
Add -7(row 2) to row 3:
Multiply through row 3 by -1/42:
Add 5(row 3) to row 2:
Add -1(row 2) and -2(row3) to row 1:
So the solution to the system is