Wednesday, February 9, 2011

If 2x+6y = 12 and y= 3x+5, find the values of x and y.

Given the system of
equations:


2x + 6y =
12..............(1)


y= 3x + 5
.............(2)


We need to find the solution to the
system.


We will use the substitution method to
solve.


We will substitute (2) into
(1)


==> 2x + 6( 3x+5) =
12


==> 2x + 18x + 30 =
12


==> 20x = 12-
30


==> 20x =
-18


==> x = -18/20 =
-9/10


Now we will substitute into (2) to find
y.


==> y= 3x +5 = 3*-9/10 + 5 = (-27 + 50)/10 =
23/10


Then the answer is : x= -9/10  and y=
23/10

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