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${3x+y=8x−2y=-4 (I)(II) $

${3⋅2+3=?82−2⋅3=?-4 $

MultiplyMultiply

${6+3=?82−6=?-4 $

AddSubTermsAdd and subtract terms

${9 =8-4=-4 $

b

${y=2x−1y=5x−7 (I)(II) $

${3=?2⋅2−13=?5⋅2−7 $

MultiplyMultiply

${3=?4−13=?10−7 $

SubTermsSubtract terms

${3=33=3 $