3x+4y =10 2x+9y =8 tentukan nilai x dan y
Matematika
vin93
Pertanyaan
3x+4y =10 2x+9y =8 tentukan nilai x dan y
2 Jawaban
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1. Jawaban missdiyun
3x+4y =10 ......(x2)
2x+9y =8.........(x3)
6x+8y=20
6x+27y=24
---------------- -
-19y = -4
y = 4/19
y=4/19 disubstitusikan ke 3x+4y=10
3x+4(4/19)=10
3x+16/19=10
3x = 10 - 16/19
3x = 190/19 - 16/19
3x = 174/19
x = 174/19/3
x = 174/19 x 1/3
x =174/57
x = 3 3/57
x = 3 1/19 -
2. Jawaban Sutr1sn0
3x + 4y = 10 (× 9)
2x + 9y = 8 (× 4)
27x + 36y = 90
..8x + 36y = 32
----------------------- -
19x = 58
x = 58/19
2x + 9y = 8
2(58/19) + 9y = 8
116/19 + 9y = 8
9y = 8 - 116/19
9y = 152/19 - 116/19
9y = 36/19
y = (36/19)/9
y = (36/19) × (1/9)
y = 4/19
Jadi HPnya adalah {58/19 , 4/19}