Does this graph represent a function? khan academy
2 answers:
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<u>Given:</u>
The two equations are and
We need to solve the equations using elimination method.
<u>Elimination method:</u>
Let us multiply the equation by 5, we get;
---------(1)
Now, multiplying the equation by -2, we get;
--------(2)
Adding equations (1) and (2), we have;
Thus, the value of y is 3.
Substituting in the equation
, we have;
Thus, the value of x is 4.
Hence, the solution of the system of equations is (4,3)
Therefore, Option A is the correct answer.
Answer:
x = -
Step-by-step explanation:
the equation of a circle centred at the origin is
x² + y² = r² ( r is the radius )
The radius of a unit circle is r = 1
substitute (x, - ) into the equation and solve for x
x² + (- )² = 1²
x² + = 1 ( subtract
from both sides )
x² = 1 - =
( take square root of both sides )
x = ± = ±
since the point is in the 3rd quadrant then x < 0
x = -