Wednesday, January 15, 2014

Determine the common point of the lines 2x+y-5=0 and -3x+4y-9=0.

To determine the crossing point of the 2 lines, we have to
solve the system formed from their equations:


2x+y=5
(1)


-3x+4y=9 (2)


We'll
multiply the relation (1) by 3 and the relation (2), by 2, and after that, we'll add (1)
to (2). We'll obtain:


6x+3y-6x+8y = 15 +
18


After reducing similar terms, we'll
get:


11y = 33


y =
33/11


y=3


We'll
substitute y by 3, into the relation (1):


2x+3 =
5


2x = 5-3


2x =
2


x =
1


The crossing point is A
(1,3).

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