Question

10 std
chapter no 1
liner equation in two veriable
x+7y=10
3x-2y=7
​

Answer 1

Step-by-step explanation:

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x+7y=10;       ------------(I)

3x−2y=7             -----------(II)

multiplying (I) with 3

3x+21y=30;            ---------(III)

3x−2y=7       ---------------(IV)

Subtracting (IV) from (III) we get

3x+21y−3x+2y=30−7

23y=23

⇒1

Putting the value of y in (IV) we get

3x−2(1)=7

⇒3x=7+2=9

⇒3x=9

⇒x=3

Thus, (x,y)=(3,1)