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2x-7y=11/*(-4)
8x+6y=18
-8x+28y= -44
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6y+28y=18-44
34y= -26/:34
y= -26/34
y= -13/17
2x-7y=11
2x-7*(-13/17)=11
2x+91/17=11
2x+5 6/17=11
2x=11-5 6/17
2x=5 11/17/:2
x=96/17 * 1/2
x=96/34
x=2 28/34
x=2 14/17
2x - 7y = 11
2x = 11 + 7y
4x + 3y = 9
x= 5,5 + 3,5y
4*( 5,5 + 3,5y)+3y = 9
22+14y + 3y=9
17y = -13
y = -¹³/₁₇
x = 5,5 + 3,5*(-¹³/₁₇) = 5,5 - 2²³/₃₄ = 2¹⁴/₁₇