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y=x+7 | 1
-y = -4x-16
y=x+7 sumamos las expresiones
-----------------
0=-3x-9
9=-3x
9/(-3)=x
-3=x
cuando x = -3
y = -3+7
y=4
se intersectan cuand x = -3 y y = 4 ----> (-3,4)