If x + 3y = 7 and y = 2, what is the value of x?

To find the value of x in the equation x + 3y = 7 when y is given as 2, you should substitute the value of y into the equation.

Start with the equation:

x + 3y = 7.

Substituting y = 2:

x + 3(2) = 7.

This simplifies to:

x + 6 = 7.

Next, to isolate x, subtract 6 from both sides:

x = 7 - 6.

Thus, you arrive at:

x = 1.

The correct answer is 1. This solution process demonstrates the importance of substituting known values into an equation and solving systematically to find the unknown variable.