Răspuns:
a) 3x + 4y = 0 b) 2x - 3y + 1 = 0 c) y = 3x - 2 d) 2x + y =5
4y = -3x 2x - 3y + 1 - 1 = 0 - 1 0 = 3x - 2 2x + y - 5 = 5 - 5
y = - 3/4x 2x - 3y = - 1 - 3x = - 2 2x + y - 5 = 0
x = 2/3
e) 4x + 3y - 12 = 0 f) y = - 1/3x + 4
4x + 3y - 12 + 12 = 0 + 12 0 = - 1/3x + 4
4x + 3y = 12 0 = - x + 12
x = 12
