Answer:
Solution:
, 
Step-by-step explanation:
<u>System of Equations</u>
Solve the system:
x + 4y = 14
3x - 2y = 7
using the elimintation method.
To use the elimination method, we must add or subtract both equations in such a way that one of the variables goes away, and only one remains.
It requires to multiply one of them by a specific factor to match the coefficients. For example, multiply the first equation by -3:
-3x - 12y = -42
And add it to the second:
3x - 2y = 7
To result:
-14y = -35
Divide by -14:

Simplifying:

Now calculate x:



Solution:
, 
Answer:
60
Step-by-step explanation:
The angle measures in a triangle always add up 180 degrees. 180-80-40=60
Answer: Here is the answer.
Step-by-step explanation:
Answer:
No
Step-by-step explanation:
20/4=5
14/3=4.67
Since they're not the same, they're not proportional.