isaiahrodriguezsm17
09.11.2021 •
Mathematics
I am not sure of the answer which one of the option is it?
Solved
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Ответ:
Step-by-step explanation:
well, there are a few things you have to burn into your brain for all times. one of these is : the sum of all angles in a triangle is always 180 degrees. it does not matter what type of triangle it is. the sum is always 180 degrees.
so,
180 = A + 80 + 40
60 degrees = A
so, B. is the right answer.
Ответ:
x - 3y = -11
add
4x = 16
x = 16/4
x = 4
3x + 3y = 27
3(4) + 3y = 27
12 + 3y = 27
3y = 27 - 12
3y = 15
y = 15/3
y = 5
solution is (4,5)