Question

Find two numbers, if their sum is 115 and their difference is 7.

Answer 1

x+y=115

x-y=21 x=y+21 now substitute (y+21) for xin the first equation.

(y+21)+y=115

y+y=115-21

2y=94

y=94/2

y=47 answer. no solve for x

x-47=21

x=47+21

x=68 answer.

proof

47+68=115

115=115

hope this helps you please follow me

Answer 2

Answer:

61 and 54

Step-by-step explanation:

x+y=115 and x-y=7 (x+x) +(y-y)=122 then 2x=122 then x=61 and 61-y=7 then y=54