Ответ:
4x+7y=
-8+9y=-1200
8x+14y=10400
-8x+9y=-1200
23y=9200
y=9200÷23=400
4x+7×400=5200
4x=5200-2800=2400
x=2400÷4=600
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Ответ:
4x+7y=
-8+9y=-1200
8x+14y=10400
-8x+9y=-1200
23y=9200
y=9200÷23=400
4x+7×400=5200
4x=5200-2800=2400
x=2400÷4=600