persamaam linear x+4y=7 3x-y=-5 nilai (x-y)=
Matematika
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Pertanyaan
persamaam linear x+4y=7
3x-y=-5
nilai (x-y)=
3x-y=-5
nilai (x-y)=
1 Jawaban
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1. Jawaban 6ilbert
x + 4y = 7
x = 7 - 4y
3x - y = -5
3 (7-4y) - y = -5
21 - 12y - y = -5
21 -13y = -5
-13y = -26
y = 2
x = 7 - 4y
= 7 - 4 . 2
= 7 - 8
= -1
x-y = -1 - 2 = -3