HELP QUICKLY it was due like a week ago and an explanation would be appreciated but you dont have to

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

What is the solution to the system of equations? y=1.5-3 y=-x

A23 – year – old male buys 100/300/100 liability insurance, collision insurance with a $100 deductible, and comprehensive insurance with a $250 deductible? what is his total annual premium? (a) $1142.00 (b) $1765.45 (c) $1770.10 (d) $1785.25