Answer:
3
Explanation:
Plug in 6 for the y value. Solve for x.
x=3 (3,6)
Y = 15 - 3x
Y = 6
6= 15-3x
-15 from each side
-9 = -3x
devide each side
ny -3
x=3
(check)
15-3(3) = 6
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