Hi Salma;
I love these questions! Thank you!
x=smaller number
y=larger number
x+y=12
y=3x6
Let's begin with the first equation...
x+y=12
Let's substitute...
x+(3x6)=12
4x6=12
Let's add 6 to both sides as we proceed to isolate x...
6+4x6=12+6
4x=18
Let's divide both sides by 4...
(4x)/4=18/4
x=9/2=4.5smaller number
124.5=7.5larger number
Let's check our work.
3x6=y
3(4.5)6=7.5
13.56=7.5
7.5=7.5
11/11/2013

Vivian L.
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