B. it’s the change in y over the change in x
5 is the mean of variable a I might be wrong
Answer:

Step-by-step explanation:
Notice that in the second equation, the coefficient of
is
times greater than in the first. Therefore, by making the coefficient of
in the second equation
times greater than in the first, it's impossible to only isolate one variable.
Therefore, when
, there are no solutions to this system.
Answer: x = 20.
Step-by-step explanation:
x and (3x + 10) combine to form a right angle, shown in the diagram by the small square joining the perpendicular lines.
Right angles are 90 degrees, so you can add both angles to get 90:

Answer:
1/3
Step-by-step explanation:
There are <u>four</u> 5's on the dial out of 12 possible stops
4/12 = 1/3 theoretical