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( x - 2y ) + ax + ay = 5
x + ax - 2y + ay = 5
( 1 + a ) x - ( 2-a) y = 5
maka M = 1 + a
2 - a
garis g :
( 5y - 3x ) - 3ax - 3ay = 12
-3x - 3ax + 5y - 3ay = 12
( -3 - 3a ) x + ( 5 - 3a) y = 12
maka M = 3 + 3a
5 - 3a
a) l // g
maka Ml dan Mg sama
1 + a = 3 + 3a
2 - a 5 - 3a
1 ( 5 - 3a ) + a( 5 - 3a ) = 2( 3 + 3a) - a( 3 + 3a )
5 - 3a + 5a - 3a² = 6 + 6a - 3a - 3a²
5 + 2a = 6 + 3a
a = -1
b ) l tegak lurus g
maka Ml x Mg = -1
1 + a x 3 + 3a = -1
2 - a 5 - 3a
( x - 2y ) + ax + ay = 5
x + ax - 2y + ay = 5
( 1 + a ) x - ( 2-a) y = 5
maka M = 1 + a
2 - a
garis g :
( 5y - 3x ) - 3ax - 3ay = 12
-3x - 3ax + 5y - 3ay = 12
( -3 - 3a ) x + ( 5 - 3a) y = 12
maka M = 3 + 3a
5 - 3a
a) l // g
maka Ml dan Mg sama
1 + a = 3 + 3a
2 - a 5 - 3a
1 ( 5 - 3a ) + a( 5 - 3a ) = 2( 3 + 3a) - a( 3 + 3a )
5 - 3a + 5a - 3a² = 6 + 6a - 3a - 3a²
5 + 2a = 6 + 3a
a = -1
b ) l tegak lurus g
maka Ml x Mg = -1
1 + a x 3 + 3a = -1
2 - a 5 - 3a