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-2x + 3y = 5
y = -2 - 3x
-2x + 3y = 5
-2x + 3 (-2 - 3x) = 5
-2x - 6 - 9x = 5
-11x - 6 = 5
-11x = 5 + 6
-11x = 11
x = -1
y = -2 - 3x
y = -2 - 3(-1)
y = -2 + 3
= 1
x - y = -1 - 1 = -2 (A)
Semoga membantu.
1.)cari nilai y ;
3x+y =-2
y =-2-3x
2.)cari nilai x ;
-2x+3y=5
-2x+3(-2-3x)=5
-2x+(-6-9x)=5
-2x-6-9x =5
-11x-6 =5
-11x =5+6
x=11/-11
x=-1
nilai y ;
-2-3x
=-2-3(-1)
=-2-(-3)
=-2+3
=1
4)nilai x-y
x-y
=-1 - 1
=-2
jadi,nilai x-y adalah -2
==>A
_____________
matpel=matematika
kelas=7 SMP
materi=Aljabar
kategori=mencari nilai variabel
kode soal =2
semoga membantu:3
semangat ya belajarnya:3
がんばっって!!