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${2x+y=86x−2y=4 (I)(II) $

${2⋅5+(-2)=?86⋅5−2⋅(-2)=?4 $

${2⋅5−2=?86⋅5−2⋅(-2)=?4 $

MultiplyMultiply

${10−2=?830+4=?4 $

AddSubTermsAdd and subtract terms

${8=834 =4 $

b

${2x+y=86x−2y=4 (I)(II) $

${2⋅2+4=?86⋅2−2⋅4=?4 $

MultiplyMultiply

${4+4=?812−8=?4 $

AddSubTermsAdd and subtract terms

${8=84=4 $