{2x-y=17
{x-2,5y=7
{x= - 17+2x
x-2,5(-17+2x) = 7
x=8,875
y= -17+2×8,875
y=0,75
(x, y) = (8,875, 0,75)
{2x-y=17
{x-2,5y=7
{x= - 17+2x
{x-2,5y=7
x-2,5(-17+2x) = 7
x=8,875
y= -17+2×8,875
y=0,75
(x, y) = (8,875, 0,75)