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${y=-7x−10y=-8x+12 (I)(II) $

${4=?-7(-2)−104=?8(-2)+12 $

${4=?14−104=?8(-2)+12 $

${4=?14−104=?-16+12 $

AddSubTermsAdd and subtract terms

${4=44 =-4 $

b

${y=-x+2y=3x+10 (I)(II) $

${4=?-(-2)+24=?3(-2)+10 $

${4=?2+24=?3(-2)+10 $

${4=?2+24=?-6+10 $

AddTermsAdd terms

${4=44=4 $

c

${-6x+3y=-24-4x−4y=-24 (I)(II) $

${-6(-2)+3⋅4=?244(-2)−4⋅4=?-24 $

${12+3⋅4=?244(-2)−4⋅4=?-24 $

${12+3⋅4=?24-8−4⋅4=?-24 $

$(I), (II):$ Multiply

${12+12=?24-8−16=?-24 $

AddSubTermsAdd and subtract terms

${24=24-24=-24 $