find four solution of the equation 2x+6y=12
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if x=0,
then
6y=12,
y=2,
1st solution=(0,2),
if y=0,
then
2x=12,
x=6,
2nd solution=(6,0),
if x=3,
then
2×3+6y=12,
6y=12-6,
6y=6,
y=1,
3rd solution=(3,1),
if y=-1,
then
2x+6×-1=12,
2x-6=12,
2x=18,
x=9,
4th solution=(9,-1)
then
6y=12,
y=2,
1st solution=(0,2),
if y=0,
then
2x=12,
x=6,
2nd solution=(6,0),
if x=3,
then
2×3+6y=12,
6y=12-6,
6y=6,
y=1,
3rd solution=(3,1),
if y=-1,
then
2x+6×-1=12,
2x-6=12,
2x=18,
x=9,
4th solution=(9,-1)
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