The equations are

,
The graphs of the solutions (x, y) of these equations are 2 parabolas, since the right hand side expressions are polynomials of degree 2.
The solution/s of the system are the x-coordinates of the point/s of intersection of the parabolas.
The solutions of the first equation form a parabola looking downwards (since the coefficient of x^2 is -), and the second, a parabola opening upwards (since the coefficient of x^2 is +).
We can draw both parabolas, but to find the solution we still need to solve the system algebraically.
The algebraic solution of the system is:

, so
the solutions are x=-1 and x=1.
The graph of the system is drawn using desmos.com
If we are allowed to use a graphic calculator, we can draw both graphs and point at the solution.
Answer:
A) 120
Step-by-step explanation:
For this question you will need to use factorials
5! =5×4×3×2×1
which equals to 120
therefore the 5 people can be selected in 120 different ways
hope this helps
Answer:
1/2n - 4 = 17
add four to both sides
1/2n = 21
n = 42
Step-by-step explanation:
Answer:
c=5
Step-by-step explanation:
3c-3(6-2c)=27
3c-18+6c=27
9c=45
c=5
Answer:
The answer is D) 4/6. This can be simplified to 2/3. Hope this helps! :)