Hi guys after the lessons i have problem understanding and solving system of linear equations. I need help badly to understand how it actually work outs???

pls help me

solve the given systems of equations by the method of elimination by substitution

33x + 2y = 34

40y = 9x + 11

by the method of elimination by addition or subtraction

2x - 3y - 4 = 0

3x + 2 = 2y