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(4x+2y=21)
___________-
=6x+2y=36
4x+2y=21
___________-
2x=15
x=7.5
3x+y=18
3.7,5+y=
22,5+y=18
y=18-22,5
=-4,5
6x +2y = 36
4x + 2y = 21
-------------- -
2x = 15
x = 15/2 = 7,5
3x + y = 18
3 (7,5) + y = 18
22,5 + y = 18
Y = 18-22,5 = - 4,5
HP = ( 7,5 , - 4,5)