Alexandrea and imani each think of a number. alexandras number is 8 more than Imanis number. the sum of two numbers is 50. what is imanis number?

Alexandera=a

imani=i

a is 8 more than i or

a=8+i

the sum of the 2 numbers is 50 or

a+i=50

a=8+i

so subsitute 8+i for a in a+i=50

8+i+i=50

8+2i=50

subtract 8 from both sides

2i=42

divide both sides by 2

i=21

subsiutte into a=8+i

a=8+21

a=29

a=29

i=21