Answer: The length of phone call is 1 minute that would cost the same for both the companies.
Step-by-step explanation:
Since we have given that
Company A - 0.35cents plus 0.3cents per minute
Company B - 0.45cents plus 0.2cents per minute
Let the number of minute be x.
So, our equation for company A would be
\(0.35+0.3x\)
our equation for company B would be
\(0.45+0.2x\)
According to question, length of phone call that would cost the same.
so, our equation becomes
\(0.35+0.3x=0.45+0.2x\\\\0.3x-0.2x=0.45-0.35\\\\0.1x=0.10\\\\x=\dfrac{0.10}{0.1}\\\\x=1\)
Hence, the length of phone call is 1 minute that would cost the same for both the companies.
