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melalui (-1, p) --> x = -1 , y = p substitusikan ke -4x +5y = -6
-4(-1) + 5(p) = -6
4 + 5p = -6
5p = -6 - 4
5p = -10
p = -10/5
p = -2
-4x+5y = -6
-4 (-1) + 5 y = -6
4 + 5y = -6
5y = -6 - 4
5y = - 10
y = -10/5 = -2
y = p = -2