cost of 3 pens and 2 copies is Rs 110 . represent in linear equation in two variables . also find the cost of one copy , if one pen costs Rs 20
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let pens and copies are x and y
3x+2y=110 (this is linear equation)
now if one pen =20means x=20
put x=20 in the above equation
3x+2y=110 (this is linear equation)
now if one pen =20means x=20
put x=20 in the above equation
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