diketahui (-5 -10)+(3-y)=(-2-8) (2y 3) (x 1)=(-12 4) nilai dari x-2y=

(-5 -10)+(3-y) = (-2-8)
(2y . 3) (x . 1) = (-12 . 4)
Pertama kita selesaikan persamaan pertama dahulu untuk mencari nilai y
(-5 -10)+(3-y) = (-2-8)
-15+3-y = -10
-12-y= -10
-y = -10+12
y = -2
Lalu substitusikan ke pers. ke 2nya
(2y . 3) (x . 1) = (-12 . 4)
(2(-2) . 3) (x) = (-48)
-12x = -48
x = -48/-12
= 4
jadi x-2y = 4 - 2(-2)
=4 - 4
= 0