dik sistem persamaan 4x-3y = 1 dan 2x -y = -3 mka nilai x-y adalah

Kelas 8 Matematika
Bab SPLDV

2x - y = -3
y = 2x + 3

4x - 3y = 1
4x - 3 . (2x + 3) = 1
4x - 6x - 9 = 1
-2x = 1 + 9
x = 10/-2
x = -5

y = 2x + 3
y = 2 . (-5) + 3
y = -10 - 3
y = -13

x - y
= -5 - (-13)
= -5 + 13
= 8

4x -3y =1
2x -y = -3
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2x - 2y = 4 => bagi 2
x -y = 2