標題:
送分!!? {2x+3y=5, 5x+9y=22
發問:
送分!! {2x+3y=5, 5x+9y=22
最佳解答:
x=-7, y=19/3
其他解答:
∴y=19/3, x=-7|||||{2x+3y=5-----[1] 5x+9y=22}-----[2] [1]x(-3), -6x-9y=-15-----[3] [3]+[2], -x=7 x=-7 代x=-7入[1] 2(-7)+3y=5 3y=19 y=19/3 所以x=-7,y=19/3 (已驗算正確)|||||2x+3y = 5 ----------(1) 5x+9y = 22 --------(2) (1) x 3 6x + 9y = 15 ------(3) (2) - (3) 5x + 9y - 6x - 9y = 22-15 -x = 7 x = -7 Put x = -7 into (1) 2(-7) + 3y = 5 3y = 5+14 y = 19/3 = 6.333
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