To add another equation to the graph of $y = 5 + 2x$, you'll need to provide the equation you'd like to add. Here are some examples:

1. $y = -3x + 4$: This is a linear equation with a negative slope.
2. $y = 2x^2 + 1$: This is a quadratic equation that opens upwards.
3. $y = \sin(x)$: This is a trigonometric function that oscillates.
4. $y = e^x$: This represents an exponential growth curve.
5. $y = \ln(x)$: This is a logarithmic function.

Please choose one or provide a different equation you'd like to add to the graph.

Tip: When graphing multiple functions, it's helpful to consider how their shapes and intersections can provide insights into their relationships.