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x + 2y = 4 ---> 2x + 4y = 8
-7y = -21
y = 3
x + 2(3) = 4
x + 6 = 4
x = -2
x + 2y = 4. l x2 l 2x + 4y = 8. -----> di eleminasi yaitu dikurang
-7y = -21
y = 3
2x - 3y = -13
2x - 9. = -13
2x = -4
x = -23
jadi penyelesaian soal di atas dengan cara eleminasi bisa juga dengan subtitusi
jadi x = -2
y =