Which of the following is true about the linear function 2y + x = 18.
(1) It has a slope of 2 and a y-intercept of 18.
(2) It has a slope of -2 and a y-intercept of 9.
(3) It has a slope of and a y-intercept of 9.
(4) It has a slope of and a y-intercept of 18.