Question

(7) 99x + 101y =499; 101x + 99y = 501​

Answer 1

Answer:

99x+101y=499 ×101 = 9999x +10201 y = 50399

101x+99y=501 × 99 = (-)9999x + (-) 9801y. =(-) 49599

____________________

400y. = 800

y. = 800/400

y. = 2

101x+99y=501

101x+99×2=501

101x+ 198 =501

101x = 501-198

101x. = 303

x= 303/101

x= 3

checking:

99x+101y

99×3 +101×2

297 +202

=499

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