Mario is a years old. In 7 years, he will be 19. Which equation can be used to determine Mario's present age?
• x - 7 = 19
• x -19 =7
• x + 7 = 19
• x + 19 = 7
The correct equation to determine Mario's present age is "x - 7 = 19"
The correct equation that can be used to determine Mario's present age is:
x + 7 = 19
This equation represents the statement that in 7 years, Mario will be 19 years old. By solving for x, we can determine his present age.
To determine Mario's present age using the given information, we need to set up an equation. Since Mario's age is currently unknown, let's represent it as "x".
According to the statement, in 7 years, Mario will be 19. This means that Mario's future age (in 7 years) will be 19. Therefore, we can set up the equation:
x + 7 = 19
This equation states that Mario's present age (x) increased by 7 years will be equal to his future age of 19.
So, the correct equation to determine Mario's present age is x + 7 = 19.