Jika diketahui sistem persamaan linear dua variabel 1234567x + 7654321y = 3456789 dan 7654321x + 1234567y = 9876543. Bagaimana cara menentukan x² - y² ? Jelaskan
budhiKumis
1234567x + 7654321y = 3456789 |x6.200004536003311 7654321x + 1234567y = 9876543 --------------------------------------------------------------------------------- - 7654321x + 47456824.9200254y = 21432107.48000635 7654321x + 1234567y = 9876543 -------------------------------------------------------------------------------- - 46222257.9200254y = 11555564.48000635 y = 0,25 masukkan nilai y ke salah satu persamaan 7654321x + 1234567(0.25) = 9876543 7654321x + 308641.75 = 9876543 7654321x = 9876543 - 308641.75 7654321x = 9567901.25 x = 9567901.25/7654321 x = 1,25
7654321x + 1234567y = 9876543
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7654321x + 47456824.9200254y = 21432107.48000635
7654321x + 1234567y = 9876543
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46222257.9200254y = 11555564.48000635
y = 0,25
masukkan nilai y ke salah satu persamaan
7654321x + 1234567(0.25) = 9876543
7654321x + 308641.75 = 9876543
7654321x = 9876543 - 308641.75
7654321x = 9567901.25
x = 9567901.25/7654321
x = 1,25
x² + y² =
0.25² +1.25² =
0.0625 + 1.5625 =
1.625
jadi x² + y² = 1.625