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2x + 2y = 14 ... (2)
2x + y = 5
y = -2x + 5 ...(3)
Subtitusi (3) ke (2)
2x + 2y = 14
2x + 2(-2x + 5) = 14
2x - 4x + 10 = 14
-2x = 14 - 10
-2x = 4
x = -4/2
x = -2 ... (4)
Subtitusikan (4) ke (1)
2x + y = 5
2(-2) + y = 5
-4 + y = 5
y = 5 + 4
y = 9
(x,y = -2,9)
Maaf kalau benar ya kak, soalnya dikelas memang saya gak terlalu cerdas.