#1
V1-x
V2-y
{2x+3y=330
{y=x+10
{2x+3y=330
{-x+y=10|*2
+{2x+3y=330
+{-2x+2y=20
5y=350|:5
y=70
2x+70*3=330
2x=330-210
2x=120|:2
x=60
#2
{2(3x-y)-5=2x-3y
{5-(x-2y)=4y+16
{6x-2y-5=2x-3y
{5-x+2y=4y+16
{6x-2y-2x+3y=5
{-x+2y-4y=16-5
{4x+y=5
{-x-2y=11|*4
+{4x+y=5
+{-4x-8y=44
-7y=49|:(-7)
y=-7
4x-7=5
4x=5+7
4x=12|:4
x=3