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3x - 18y = -21 (ditambah)
-13y= -13
y = 1
(trus masukin hasil y ke salah satu persamaan yg disoal)
-3x + 5y = 8
-3x + 5.1 = 8
-3x + 5 = 8
-3x = 8-5
-3x = 3
x = -1
jawabannya B
x-6y= -7⇒×3 ⇔3x-18y = -21 +
-13y=-13
y= -13/-13
y= 1
x-6y = -7
x-6(1)= -7
x-6=-7
x= -7 + 6
x = -1
jadi jawabanya adalah B .(-1,1)
semoga membantu