# Post your question here (Keep it simple and clear to get the best answers)x+2y=7,x-2y=1

1
by Starfacemn

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by Starfacemn

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X+2y=7-equation 1

x-2y=1-equation 2

equation 1-2

x+2y=7

x-2y=1

now,

look in eq 2

there +x becomes -x

-2y becomes +2y

+1 becomes -1

so,

both x cancels, 2y+2y=4y

7-1=6

so 4y=6

y=6\4

y=3\2

from equation 1 (or u may take 2)

x+2y=7

x+2(3\2)=7

x+3=7

x=7-3

x=4

x-2y=1-equation 2

equation 1-2

x+2y=7

x-2y=1

now,

look in eq 2

there +x becomes -x

-2y becomes +2y

+1 becomes -1

so,

both x cancels, 2y+2y=4y

7-1=6

so 4y=6

y=6\4

y=3\2

from equation 1 (or u may take 2)

x+2y=7

x+2(3\2)=7

x+3=7

x=7-3

x=4