{7×+4y=13
{5x-2y=19
7x=13-4y/7
5(13-4y/7)-2y=19
5( 13-4y)-14y=133
65-20y-14y=133
-20y-14y=133+65
-34y=198
y=198/-34
y=5,5
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{7×+4y=13
{5x-2y=19
7x=13-4y/7
5(13-4y/7)-2y=19
5( 13-4y)-14y=133
65-20y-14y=133
-20y-14y=133+65
-34y=198
y=198/-34
y=5,5