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3x-2y+6=0 and x+2y-6=0

find the value of x and y

 Jan 28, 2017

Best Answer 

 #1
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+5

Solve the following system:
{6 + 3 x - 2 y = 0 | (equation 1)
-6 + x + 2 y = 0 | (equation 2)
Express the system in standard form:
{3 x - 2 y = -6 | (equation 1)
x + 2 y = 6 | (equation 2)
Subtract 1/3 × (equation 1) from equation 2:
{3 x - 2 y = -6 | (equation 1)
0 x+(8 y)/3 = 8 | (equation 2)
Multiply equation 2 by 3/8:
{3 x - 2 y = -6 | (equation 1)
0 x+y = 3 | (equation 2)
Add 2 × (equation 2) to equation 1:
{3 x+0 y = 0 | (equation 1)
0 x+y = 3 | (equation 2)
Divide equation 1 by 3:
{x+0 y = 0 | (equation 1)
0 x+y = 3 | (equation 2)
Collect results:
Answer: |x = 0                 and                y = 3

 Jan 28, 2017
 #1
avatar
+5
Best Answer

Solve the following system:
{6 + 3 x - 2 y = 0 | (equation 1)
-6 + x + 2 y = 0 | (equation 2)
Express the system in standard form:
{3 x - 2 y = -6 | (equation 1)
x + 2 y = 6 | (equation 2)
Subtract 1/3 × (equation 1) from equation 2:
{3 x - 2 y = -6 | (equation 1)
0 x+(8 y)/3 = 8 | (equation 2)
Multiply equation 2 by 3/8:
{3 x - 2 y = -6 | (equation 1)
0 x+y = 3 | (equation 2)
Add 2 × (equation 2) to equation 1:
{3 x+0 y = 0 | (equation 1)
0 x+y = 3 | (equation 2)
Divide equation 1 by 3:
{x+0 y = 0 | (equation 1)
0 x+y = 3 | (equation 2)
Collect results:
Answer: |x = 0                 and                y = 3

Guest Jan 28, 2017
 #2
avatar+37093 
+5

From second equation : x = 6 - 2y   substitute this value of x into the first equation

 

3(6-2y) - 2y +6 = 0

18-6y-2y+6 = 0

24-8y=0

y=3                 SUstitute this value of y into one of the equations to find x     x +2(3) -6 = 0    then x= 0

 Jan 28, 2017

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