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Verified answer
MatriksKelas X
x + 2y + 4 = 13
x + 2y = 9 |x 3|
3x + 6y = 27 ... (i)
-10x - 6y + 2 = -4
10x + 6y = 6 ... (ii)
Eliminasi (i) dan (ii)
3x + 6y = 27
10x + 6y = 6
––––––––– (–)
-7x = 21
x = -3
3(-3) + 6y = 27
6y = 27 + 9
6y = 36
y = 6
5y - 2x = 5(6) - 2(-3)
= 30 + 6 = 36