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{2x+y=11
-1,5x-y=-7,5
2x+y=11
------------------------
0,5x=3,5 |:0,5
x=7
3*7+2y=13
x=7
2y=-8 |:2
x=7
y=-4
b.
{2x-3y=7 |*(-3)
{3x-5y=11 | *2
-6x+6y=-21
6x-10y=22
---------------
-4y=1 | :(-4)
y=-1/4
2x=7+3*(-1/4)
y--1/4
2x=6,25 |:2
y=-1/4
x=3,125
y=-1/4
1.
{x =7
{y =-4
2.
{x = 3,125
{y = -0, 25