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${x+y=42x−y=1 (I)(II) $

${4+1=?42⋅4−1=?1 $

Multiply$(II):$Multiply

${4+1=?48−1=?1 $

AddSubTermsAdd and subtract terms

${5 =47 =1 $

b

${x−4y=02y=4x +1 (I)(II) $

${4−4⋅1=?02⋅1=?44 +1 $

MultiplyMultiply

${4−4=?02=?44 +1 $

CalcQuot$(II):$Calculate quotient

${4−4=?02=?1+1 $

AddSubTermsAdd and subtract terms

${0=02=2 $