The student solved the problem incorrectly. The student should add 12.7 to both sides of the equation to isolate the variable, y.
Answer: 60
Step-by-step explanation: See photo.
Answer: sorry i cant see the picture by any chance you think you can ss and send in the comments?
Step-by-step explanation:
Maria = x
Tom = y
Use substitution
x+y=30
2y=x
2y+y=30
3y=30
y=10
Tom is 10 years old.
x+y=30
x+10=30
x=20
Maria is 20 years old.