The sum of two numbers is 17 the difference of the two number is 13 what are the numbers

Mathematics · Middle School · Thu Feb 04 2021

Answered on

Let the bigger number be X

And the smaller number be Y

X+Y=17     ……(1)

X-Y=13    …….(2)

Using substitution method:

from equation (1)

X=17-Y      ….(3)

Now, substituting value of x in equation (2)

(17-Y)-Y=13

17– Y - Y=13

17–13=2Y

4=2Y

Y=2

Now, substituting value of y in equation (3)

X=17–2=15 

 

Therefore, the bigger number is 15 and smaller number is 2.