Answer:
and 
Step-by-step explanation:
Let
x -----> the number of polyphonic ringtones
y ----> the number of standard ringtones
we know that
-----> equation A
-----> equation B
Solve the system of equations by substitution
Substitute equation A in equation B and solve for y





Find the value of x
Answer:
{x ∈ ℝ | x ≠ 2}
Step-by-step explanation:
4 units right and 4 units down