16. Himpunan penyelesaian dari sistem per- samaan linear dua variabel 2x + 5y = 6 dan 3x + y = -4 adalah .... a. (-2,-2) b. (-2, 2) c. (2,-2) d. (2, 2)
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Penjelasan dengan langkah-langkah:
2x + 5y = 6
3x + y = -4
eliminasi x dengan mengalikan 3 pers 1 dan 2 pers 2
6x + 15y = 18
6x + 2y = -8. -
13y = 26
y = 26 ÷ 13
y = 2
2x + 5(2) = 6
2x + 10 = 6
2x = 6 - 10
2x = -4
x = -4 ÷ 2
x = -2
HP = ( -2, 2 ) B ✓