Answer:
Option 4
Step-by-step explanation:
=> 
Combining like terms
=> 
=> 
Answer: 
Step-by-step explanation:

z = 2y
Step-by-step explanation:
..... (given)
... (exterior alternate angles)

Answer:
Step-by-step explanation:
Combine any like terms on each side of the equation: x-terms with x-terms and constants with constants. Arrange the terms in the same order, usually x-term before constants. If all of the terms in the two expressions are identical, then the two expressions are equivalent.
<h3>Substitute and Check:</h3>

<h3>We can stop here and conclude that ( 1 , 3 ) is not a solution to this system, since it does not even satisfy the first equation, but check for the other one just in case:</h3>
