Pls help with this asap

Can someone me i’m confused. will give brainliest and a whole bunch of points

Will mark 50 show all what is the solution to the system of equations? use the substitution method and show your work. -5x+y= -3 -15 x+3y=7 explain what your answer in part (a) tells you about the association of the lines in this system.

4. a single woman uses an online cash flow calculator which reveals a cash flow of 203. what does this mean?