<PRE><B>Question 147127</B>
x + y = 56 first equation
I have 3 times as many y as x, so the next equation is
y = 3x
:
Substitute 3x for y in the 1st equation
x + 3x = 56
4x = 56
x = {{{56/4}}}
x = 14
:
Does this explain it?</PRE>