The equation of the line Tina drives back to her camera's GPS homing device is y = -x + 10.
To find the equation of the line Tina drives back to her camera's GPS homing device, we need to determine the slope and y-intercept of the line.
The answer choices are given in the form y = mx + b, where m represents the slope and b represents the y-intercept.
We can determine the slope by examining the given options.
Since the slope of a line is equal to the coefficient of x, we look for the common coefficient of x among the answer choices.
In this case, the coefficient of x is -1 in all the options.
Now we need to determine the y-intercept, which represents the value of y when x = 0.
From the options, we can see that the y-intercept is different for each equation.
Therefore, we look for the option that has the y-intercept closest to Tina's starting point, which is 10.
The equation that satisfies both conditions is y = -x + 10, so the correct answer is A).