Maths(f.1-f.2)
2007-09-01 6:23 am
If the points A ( r, 2 ) and B ( -1, s ) lie on the graph of the equation 4x + 7y = 10, find the values of r and s.
回答 (3)
2007-09-01 6:29 am
✔ 最佳答案
substitute x=r, y=2 into the equation4x + 7y = 10.4r+7(2)=10
4r+14=10
4r=-4
r=-1
substitute x=-1, y=s into the equation4x + 7y = 10.
4(-1)+7s=10
-4+7s=10
7s=-14
s=-2
參考: ME
2007-09-01 6:26 am
r = -1
s = 2
s = 2
2007-09-01 6:26 am
4r + (7)(2) = 10
4r + 14 = 10
4r = -4
r = -1
(4)(-1) + 7s = 10
-4 + 7s = 10
7s = 14
s = 2
4r + 14 = 10
4r = -4
r = -1
(4)(-1) + 7s = 10
-4 + 7s = 10
7s = 14
s = 2
收錄日期: 2021-04-13 16:30:41
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