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2010-03-24T20:38:01+01:00
A)
x+y=20 /*-( 2)
2x+3y=52

-2x-2y = -40
2x + 3y = 52

y = 12 x + 12 = 20
x = 20 - 12
x = 8

b)
2x+y=16 / *6
5x-6y=0

12x + 6y = 96
5x - 6y = 0 y = 272/17 - 96/17 = 176/17 = 10 6/7

17x = 96 // 17
x = 5 11/17 y = 272/17 - 96/17 = 176/17 = 10 6/7
2010-03-24T20:38:53+01:00
A){x+y=20 |x(-2) b){2x+y=16 |x6
{2x+3y=52 {5x-6y=0
{-2x-2y=-40 {12x+6x=96
+{2x+3y=52 +{5x-6y=0
y=12 17x=96 |:17
x+y=20 x=5 11/17
x+12=20
x=20-12
x=8