Use an HTML table with two cells
Use CSS flexbox with two image elements
Use CSS grid with two columns
Place both images in a single row in a word processor
Insert both images into a layout app and align them horizontally
Use a photo collage or editing tool with a side-by-side template
Set both images to float left with matching widths
Use Markdown table formatting if supported
Use a presentation slide and arrange the images next to each other
Use an image editor to combine them into one canvas