Easy algebra 1 & it's worth 65 points PLS HELP pls show ur work

1) solve the following system of equation using the elimination method. show all steps clearly to demonstrate ur understanding of the method. show your work.

-4x+9y=9

x-3y=-6

2) solve the following system of equations using the substitution method. show all steps clearly to demonstrate your understanding of the method. show your work.

x+3y=1

-3x-3y=-15