Answer:
42
Step-by-step explanation:
x+(x+13)=71
2x+13=71
2x=71-13
2x=58
x=29 (alvin)
71-29=42 (elga)
To solve this we can use systems of linear equations. (two equations)
a is avlins age
e is elgas age
a + 13 = e ( simplifys to a - e = 13 )
a + e = 71
add
a - e = -13
a + e = 71
2a = 58
a = 29 (alvin is 29 years old)
to find elgas age... substitute a into an original equation
(29) + 13 = e
elga is 42 years old
brainliest plz
