Solve the systems of equations by elimination.
1. -2x+y=7 2. 2x+y=-9
6x+12y=24 4x+3y=1
3. 7x+3y=-1.5 4.2x-3y=-0.27
2x-5y=-30.3 5x2y=0.04
Tutors do not do your homework.
The only way you will learn is by trying to solve these yourself.
See your first post/problem below.
I worked out one problem in detail. Follow this example to do all these problems.
If you get stuck post your work and someone will help you.