Question

The sum of two positive integers is 13 the difference between these numbers is 7 what is their product ? Explain :

Could someone please help!

Answer 1

a+b=13
a-b=7
add the two equations using system of equations
2a=20
a=10
10+b=13
b=3

Answer 2

Explanation:

Let one number be x

Other number = 13 - x {as sum of two numbers is 13}

x - [13 -x] = 7 { difference of two numbers is 7}

x - 13 +x =7

2x - 13 = 7

2x = 7 + 13

2x = 20

x = 20/2

x = 10

One number = 10

Other number = 13 - 10 = 3

Product = 10 * 3 = 30