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2x/9 + y/4=11 |*36
5x/12 + y/3 = 19 |*12

4*2x + 9y = 396
5x + 4y = 228

8x + 9y = 396
5x + 4y = 228

8x = 396 - 9y|:8
5x = 228 - 4y|:5

x = (396 - 9y)/8
x = (228 - 4y)/5

(396 - 9y)/8 = (228 - 4y)/5 |*40
5*(396 - 9y) = 8*(228 - 4y)
1980 - 45y = 1824 - 32y
-45y + 32y = 1824 - 1980
-13y = -156 |: (-13)
y = 12
y reiksme isistatome i viena is iksu isreikstu reiskiniu:
x = (396 - 9y)/8 = (396 - 9*12)/8 = (396 - 108)/8 = 288/8= 36
(36;12)
Ats.: (36;12)