標題:
S.2 MTH linear equation ..急!!!
發問:
#1 Father's age is now 6 times his son's age. 5 years later, father's age will be less than 4 times his son's age by 5. Find the age of the son now.
最佳解答:
您好，我是 lop，高興能解答您的問題。 Let the age of the son now be x , then the aeg of his father is 6x . Then , 4(x+5) - 5 = 6x+5 4x + 20 - 5 = 6x + 5 4x + 15 = 6x + 5 4x - 6x = 5 - 15 -2x = -10 x = (-10)/(-2) x = 5 Answer : The age of the son now is 5 . 2011-12-23 14:46:57 補充： Let the age of the son now be x , the age of his father be y. Then , 6x = y --- (1) 4(x+5) - 5 = y + 5 --- (2) Sub (1) into (2) , 4(x+5) - 5 = 6x + 5 4x + 20 - 5 = 6x + 5 4x + 15 = 6x + 5 4x - 6x = 5 - 15 -2x = -10 x = (-10)/(-2) x = 5 Answer : The age of the son now is 5 .
其他解答:
of course you can set up a pair of equations, but it further goes as what 知識長stated. i. F = 6S ii. F+5 = 4(S+5)-5 => F-10 = 4S|||||Could you set the eqt with two unknowns?
S.2 MTH linear equation ..急!!!
發問:
#1 Father's age is now 6 times his son's age. 5 years later, father's age will be less than 4 times his son's age by 5. Find the age of the son now.
最佳解答:
您好，我是 lop，高興能解答您的問題。 Let the age of the son now be x , then the aeg of his father is 6x . Then , 4(x+5) - 5 = 6x+5 4x + 20 - 5 = 6x + 5 4x + 15 = 6x + 5 4x - 6x = 5 - 15 -2x = -10 x = (-10)/(-2) x = 5 Answer : The age of the son now is 5 . 2011-12-23 14:46:57 補充： Let the age of the son now be x , the age of his father be y. Then , 6x = y --- (1) 4(x+5) - 5 = y + 5 --- (2) Sub (1) into (2) , 4(x+5) - 5 = 6x + 5 4x + 20 - 5 = 6x + 5 4x + 15 = 6x + 5 4x - 6x = 5 - 15 -2x = -10 x = (-10)/(-2) x = 5 Answer : The age of the son now is 5 .
其他解答:
of course you can set up a pair of equations, but it further goes as what 知識長stated. i. F = 6S ii. F+5 = 4(S+5)-5 => F-10 = 4S|||||Could you set the eqt with two unknowns?
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