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2k+l=9
dikurangkan, dpat nilai k, nanti masukkin aj nilai k ke salah satu persamaan nanti dpt nilai l
f(-4) = -3
-4k + l = -3
dan
f(2) = 9
2k + l = 9
-4k + l = -3
2k + l = 9
_________ -
-6k = -12
k = 2
substitusikan k ke salah satu persamaan
2(2) + l = 9
l = 5
jadi nilai k = 2 dan l = 5