Simultaneous linear equation

the price of 1kg of fruits and 2kg of vegetables is $8. the difference between 2kg of fruits and 1kg of vegetables is $1. calculate the price of 1 kg of fruits without using the matrix method.

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

On friday, there were x students at the baseball game. on monday, there were half as many students at the game as there were on friday. on wednesday, there were 32 fewer students at the game as there were on friday. which expression could represent the total number of tickets sold for all 3 games?

What is the value of x? assume that the line is tangent to the circle.