Step-by-step explanation: To find the area of a region in a coordinate plane, you need to integrate the function over that region. In this case, we have two functions, f(x) = 1 + x and g(x) = 10 - 2x. We want to find the area enclosed between them and the y-axis.
To do this, we can use integration techniques like substitution or separation of variables. However, since both functions are linear, we can simply add their areas to get the total area.
The area of f(x) from x = -∞ to x = ∞ is infinite, while the area of g(x) from x = -∞ to x = ∞ is also infinite. Therefore, the combined area is infinite as well.