# Simultaneous Equations Help

• Jan 18th 2009, 02:12 PM
22upon7
Simultaneous Equations Help
Could someone please show me how to do this sum using simultaneous Equations, step by step so I could use it as an example to work out similar sums?

In four years time a mother will be three times as old as her son. Four years ago she was five times as old as her son. Find their present ages.
• Jan 18th 2009, 02:31 PM
vincisonfire
• Jan 18th 2009, 02:43 PM
22upon7
Quote:

Originally Posted by vincisonfire

Thanks, I know how to work the simultaneous equations out but I need to know how to construct the simultaneous equation for these kind of sums.
• Jan 18th 2009, 02:45 PM
vincisonfire
x = age of mother now
y = age of son now
x+4 = age of mother in four years
y+4 = age of son in four years
etc.
First statement : $x+4=3(y+4)$
Second statement : $y-4=5(y-4)$