lengkapi pasangan berurutan untuk tiap - tiap persamaan berikut. A. Y = -x + 6 ; (9,...) B. Y = 6x - 7 ; (2,...) C. 2x - 15y = 13, (..., - 3/4) D. - x + 12y = 7

a. y = -x + 6 (9,_)
y = -9 +6
y = -3 (9,-3)
b. y = 6x - 7 (2,_)
y = 12 - 7
y = 5 (2,5)
c. 2x - 15y = 13 (_,-3/4)
2x - 15(3/4)= 13
2x -45/4 = 13
2x = 13-45/4
2x = (52-45)/4
2x = 7/4
x = 7/8 (7/8 , -3/4)
d. -x + 12y = 7 (_,3/4)
-x + 12(3/4) = 7
-x + 9 = 7
-x = 7 - 9
x = 2 (2,3/4)