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2(5x-1)+3y=5(3x+y)+2 => 10x-2+3y=15x+5y+2 => 5x+2y=-4
6x+4y=20
5x+2y=-4 //*2
6x+4y=20
4y=-8-10x
6x-8-10x=20
4y=-8-10x
-4x=28 //:(-4)
4y=-8-10x
x=-7
4y=-8-10*(-7)
x=-7
4y=-8+70 //:4
x=7
y=15,5
6x-3+4y-8=9
10x-2+3y=15x+5y+2
6x+4y=20
-5x-2y=4/*2
6x+4y=20
-10x-4y=8
-4x=28
x=-7
-7*6+4y=20
4y=20+6*7
y=15,5
2
a) -5x+2y=-1
b)-5x+2y-15=0
3(2x - 1 ) + 4(y - 2 ) = 9
2(5x - 1 ) + 3y = 5(3x + y ) + 2
6x-3+4y-8=9
10x-2+3y=15x+5y+2
6x+4y -20=0
-5x-2y-4=0
6x+4y-20=0
-10x-4y-8=0
-4x-28=0
x=-7
y=10,5
2.a)
2( x - y) + 3x - 1 = 0
5+4-10+5x-2x+2(x-y)=0
b)2( x - y) + 3x - 1 = 0
x+y=0