Vivian L. answered • 11/11/13

Tutor

3
(1)
Microsoft Word/Excel/Outlook, essay composition, math; I LOVE TO TEACH

Hi Salma;

I love these questions! Thank you!

x=smaller number

y=larger number

x+y=12

y=3x-6

Let's begin with the first equation...

x+y=12

Let's substitute...

x+(3x-6)=12

4x-6=12

Let's add 6 to both sides as we proceed to isolate x...

6+4x-6=12+6

4x=18

Let's divide both sides by 4...

(4x)/4=18/4

x=9/2=4.5---smaller number

12-4.5=7.5---larger number

Let's check our work.

3x-6=y

3(4.5)-6=7.5

13.5-6=7.5

7.5=7.5

Silvia D.

this helped me too!
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03/11/19

Salma R.

11/11/13