(40 points) (Pre Cal) Can someone help me understand how to solve this problem? Not just the answer to the problem but the process too. Thank you.

Galen sold tickets of his church’s carnival for a total of $2,820. children’s tickets cost $3 each and adult tickets cost $5 each. the number of children’s tickets sold was 30 more than 3 times the number of adult tickets slod. how many children’s ticket and how many adult tickets did he sell?

Based on the graph, what is the initial value of the linear relationship? a coordinate plane is shown. a line passes through the y-axis at -2 and the x-axis at 3.

Justin has 750 more than eva and eva has 12 less than justin together they have a total of 63 how much money did