Choosen As Best Answer

(以下照我寫的打,可能有打錯的地方)

6.
2(x + y) + 3(y - x) = 30
9x + 2(x + y) = 126

-x + 5y = 30
11x + 2y = 126

-2x + 10y = 60
55x + 10y = 630

57x = 570, => x = 10, y = 8

7.
3x - 4y - 1 = 6x - 3y + 6
8x + 4y + 6 = 7x + y + 9

3x + y = -7
x + 3y = 3

3x + y = -7
3x + 9y = 9

8y = 16, => y = 2, x = -3

8.
3x + 2y = 6 + 6x
2x + 3y = 6 + 6y

3x - 2y = -6
2x - 3y = 6

6x - 4y = -12
6x - 9y = 18

5y = -30, => y = -6, x = -6

訪客

謝謝🙏🏻

Post A Comment
News
【IG直播懶人包】十大科目筆記方法分享
【開學必讀】準高中、準大學生必知二三事
【筆記方法】國文筆記怎麼做,三個超強筆記方法大公開