keeks11
28.01.2020 •
Mathematics
¿cuáles de estas estrategias eliminan una variable en el sistema de ecuaciones? { 2 x + 3 y = − 5 2 x − 3 y = 10 ⎩ ⎪ ⎪ ⎨ ⎪ ⎪ ⎧ 2x+3y=−5 2x−3y=10
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Ответ:
Shania is correct.
Step-by-step explanation:
For a right angled triangle, given two sides and an angle, we can use the sine rule or the various trigonometry identities to solve the triangle;
a/sin A = b/sinB
and
sin (angle) = opposite side/hypotenuse
cos (angle) = adjacent side/hypotenuse
tan (angle) = opposite/ adjacent
assuming a is the opposite side of angle A and b is also opposite of angle B
Otherwise, the only way to solve a triangle given two sides only is by the use of the Pythagoras theorem.
Hence, Shania is correct.