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Find the equation of the line joining the point (3,7) to the point of intersection of the lines x+y=4 and x-y+3=0
jawab
mencari perpotongan
x+y=4 ⇒x+y=4
x-y+3=0 ⇒ x-y=-3
dieliminasi 2y=7
y=3,5
x+y=4
3,5+y=4
y=4-3,5
y=0,5
titik perpotongan adalah (3,5;0,5)
mencari persammanan dari titik(3,7) dan (3,5;0,5)
[/tex]
-6,5x+19,5=0,5y-3,5
-6,5x-0,5y=-3,5-19,5
-6,5x-0,5y=-23
6,5x+0,5y=23
jadi persamaan adalah 6,5x+0,5y=23