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2x+y=7 .... (2)
dari pers.(2) diperoleh
2x + y = 7
y = 7 - 2x .... (3)
substitusikan pers.(3) ke pers.(1)
3x - 4y = 10
3x - 4(7 - 2x) = 10
3x - 28 + 8x = 10
11 x = 10 + 28
11 x = 38
x = 38/11
substitusikan nilai x ke pers.(3)
y = 7 - 2x
y = 7 - 2(38/11)
y = (77-76)/11
y = 1/11
semoga membantu ^^