What color plus yellow equals light blue or light gray?

To achieve light blue, you can mix yellow with a small amount of blue, as blue and yellow together create green, and adding more blue will give you a lighter shade. For light gray, mixing yellow with a little bit of black or gray can help achieve that muted tone, though yellow will usually produce a warmer gray. The key is to balance the colors and adjust the proportions to get the desired lightness and hue.