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y = - 9 + 6
y = -3 ---> ( 9 , - 3)
b. 2x - 15y = 13 ( - ¾) gak jelas - 3/4 x atau y ..?
c. y = 6x - 7; (2, )
y = 6.(2) - 7
y = 12 - 7
y = 5 -----> (2 , 5)
d. -x + 12y = 7; ( , ¾)
- x + 12.(3/4) = 7
- x + 9 = 7
- x = 7 - 9
- x = -2
x = 2 ------> (2 , 3/4