Answer:
infinitely many solutions
Step-by-step explanation:
We want to find solution to the system:
-4y=-20x+40
y+10=5x
We make y the subject in the second equation to get;
y=5x-10
We substitute y=5x-10 into the top equation to get:

We expand to obtain;

This implies that:

Therefore the system has infinitely many solutions.
Answer: b
Step-by-step explanation:
Answer:
Option 4 - The expression is equivalent to 12 + 3 + (-7) because of the commutative property.
Step-by-step explanation:
To find : Which statement is true about the expression
?
Solution :
Associative property states that, 
Commutative property states that, 
By definition of properties we conclude that option 4 applies the correct property i.e. commutative.
As 


Therefore, The expression is equivalent to
because of the commutative property.
So, Option 4 is correct.
Answer: 22
Step-by-step explanation:
Lines a and b are cut by transversal f.
Then from the given information,
[ If two parallel lines are cut by a transversal then, the alternate exterior angles are equal. ]

Hence, the value of x so that lines a and b are parallel lines cut by transversal = 22
Answer:
AAS
Step-by-step explanation: