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4x+3y=-1 |x4|
9x+12y = 54
16x+12y = -4 -
-7x = 58
x = -58/7
4x+3y = -1
4. -58/7 + 3y = -1
-232/7 + 3y = -1
3y = -1 + 232/7
3y = -7/7 + 232/7
3y = 225/7
y = 75/7
y = (-4x - 1)/ 3
3x + 4y = 18
3x + 4(-4x-1)/3 = 18
9x + 4 (-4x-1) =54
9x -16x -4 = 54
-7x = 58
x = 8,3
4x + 3 y = -1
33,2 +3y = -1
3y = -34,2
y =-34,2 / 3