I need some step my step notes on how to solve systems of equations like this for example

System of equations:

• Equation 1

• Equation 2

Procedure

This system is easier if we solve it using the elimination method, in which we multiply the first equation times minus one, add both equations to eliminate the x variable, and solve for y.

0. Multiplying Equation 1 times minus 1.

2. Adding both equations:

Then:

3. Finally, substituting this value in any equation and solving for x:

y = 9 and x = -5.

the number of the people going.

step-by-step explanation:

the cost to buy one movie ticket is $7. if the total cost for the movie is a function of how many people go, then the input is : the number of the people going.