me resuelven esta ecuación lineal por fa , can you solve this linear équation for me please , 4×-2=8-×

What is the value of f(x) = 2.2 for f(-2)?

The students at jefferson middle school are raising money for a charity by selling t-shirts and hats. the number of t-shirts sold was 3 times the number of hats. the profit was $5 for each t-shirt sold and $2.50 for each hat sold. the students raised $840 for the charity. they used the system below to analyze their success and found the solution to be (144, 48). 5x+2.50y=840 x=3y how much did they earn from t-shirt sales?

Explain how the quotient of powers was used to simplify this expression.