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Afina-wow [57]
3 years ago
7

Two angle measures in a scalene triangle are 38° and 25°. What is the measure of the third angle?

Mathematics
2 answers:
Akimi4 [234]3 years ago
6 0
Angles in a triangle add up to 180°
180 - 38 - 25 = 117°
NISA [10]3 years ago
5 0
117, just add the two and subtract from 180
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Explanation:

The first equation given is y = 3 - 1/2x
In other words, y is the same as 3 - 1/2x. 
We can replace y in the second equation with 3 - 1/2x
This is known as substitution (think of a substitute teacher who is a temporary replacement for your teacher)

Doing this leads to...
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3x+4*y = 1
3x+4*( y ) = 1
3x+4*( 3 - 1/2x ) = 1 <<--- y has been replaced with 3-1/2x
3x+4*(3) +4*(-1/2x) = 1
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x+12 = 1
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x = -11
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6 0
3 years ago
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3 years ago
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Step-by-step explanation:

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