SOLUTION: Hi there please help I am parent trying to help my eldest on Equation in year 9, this the question,{{{In two years time Geoff will be three times as old as he was ten years ago. a)
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Question 166215: Hi there please help I am parent trying to help my eldest on Equation in year 9, this the question, This is where I am stuck because I don't if my equation is correct or not?
thanks Nick. Found 2 solutions by ankor@dixie-net.com, scott8148:Answer by ankor@dixie-net.com(22740) (Show Source):
You can put this solution on YOUR website! In two years time Geoff will be three times as old as he was ten years ago.
a)Using y for his present age, write down an equation connecting his present
age with his age ten years ago?
:
Two things to note in this:
:
Age in two years: (y+2)
Age 10 yrs ago: (y-10)
:
In two yrs = 3 times age 10 yrs ago
y + 2 = 3(y - 10)
:
b)Solve the equation.
:
y + 2 = 3y - 30; multiplied what's inside the bracket
:
y + 2 + 30 = 3y; add 30 to both sides
:
32 = 3y - y; subtract y from both sides
:
y =
:
y = 16 yrs; his age now
:
:
Try this in the original statement, see if works
"In two years time Geoff will be three times as old as he was ten years ago."
16 + 2 = 3(16 - 10)
18 = 3(6)
:
You don't need brackets around the problem
