Alright, lets get started.
Maria hiked the 5 mile Mountain Trail a number of times and she hiked the 10 mile canal trail several times.
x times she hiked 5 mile mountain.
So, number of mils she hiked for 5 miles will be = 5 x
Similarly,
y times she hiked 10 mile canal,
So, number of miles she hiked for canal = 10 y
So, total number of miles she hiked = ![5 x +10 y](https://tex.z-dn.net/?f=5%20x%20%2B10%20y)
But as per question given, she had a total of 90 miles
It means
![5x + 10 y = 90](https://tex.z-dn.net/?f=5x%20%2B%2010%20y%20%3D%2090)
Dividing this equation with 5
![x + 2 y = 18](https://tex.z-dn.net/?f=x%20%2B%202%20y%20%3D%2018)
So, the equation is
: Answer
Hope it will help :)