For this case we must solve the following system of equations:

To solve we follow the steps below:
We multiply the second equation by -3:

Thus, we have the equivalent system:

We add the equations:

We look for the value of the variable "y":

Thus, the solution of the system is given by:

Answer:

Answer:
50$
Step-by-step explanation:
$1.25x40= 50 so she would have to pay 50$
Answer:
f(4)
Step-by-step explanation:
replace the x in f(x) with 4
2.964 bolts
Because 7.8*.38=2.964