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m = ( 5 + 7 ) : ( -1 - 2 )
m = 12 : -3
m = -4
Persamaan garis :
y = -4x - ( -4(2) + 7 )
y = -4x - ( -8 + 7 )
y = -4x + 1
Maka :
m = -4
c = 1
Jadi, nilai :
m + c = -4 + 1 = -3