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Masukin x=A dan y=5
2x+4y=12
2(A)+4(5)=12
2A+20=12
2A= 12-20
2A = -8
A =-8/2
A =-4
Coba masukin lagi lewat rumus mencari persamaan lewat dua titik supaya pasti hasilnya -4
m nya -2/4 karena rumus mencari gradien lewat ax+by= c itu -a/b
y-y1=m(x-x1)
y-5= -2/4 (x-(-4))
4(y-5)=-2(x+4)
4y-20 = -2x-8
4y = -2x-8+20
4y = -2x+12
2x+4y = 12
Jadi a= -4 itu benar :p