Знайдіть модуль вектора n=3a-4b де вектор а(1;-2), b(-1;3)

1) 3,2x-1,7x=1.5
1.5x=1.5
x=1

2) 2-0.9x+1.3=1.3x
3.3=1.3x+0.9x
2.2x=3.3
x=3.3/2.2
x=1.5

3) -3.3x-1.2-0.7x-1.6=0
-3.3x-0.7x=1.6+1.2
-4x=2.8
x=2.8/(-4)
x=-0.7

4) -4.1x-2.5-2.3x-3.9=1.6x
-4.1x-2.3x-1.6x=3.9+2.5
-8x=6.4
x=6.4/(-8)
x=-0.8

5) 3.6x+2.5-1.8x-2.3=1.6x
3.6x-1.8x-1.6x=2.3-2.5
0.2x=-0.2
x=-0.2/0.2
x=-1

6) 8.8x+4.7-5.4x-2.2=-1.6x
8.8x-5.4x+1.6x=2.2-4.7
5x=-2.5
x=-2.5/5
x=-0.5

7) 7.4x-12.3x-1.56+2.3x=2.6x
7.4x-12.3x+2.3x-2.6x=1.56
-5.2x=1.56
x=1.56/(-5.2)
x=-0.3

8) -2.9+8.2x-1.6+4.7x-2.9x=3.2
8.2x+4.7x-2.9x=3.2+2.9+1.6
10x=7.7
x=7.7/10
x=0.77

9) -4.1x+5.5x-7.3x-3.6=-5.3x
-4.1x+5.5x-7.3x+5.3x=3.6
-0.6x=3.6
x=3.6/(-0.6)
x=-6

10) 1.8x-1.9-2.7x+3.7=2.1x
1.8x-2.7x-2.1x=1.9-3.7
-3x=-1.8
x=(-1.8)/(-3)
x=0.6