Combining two equations

Unsure of how to start the algebraic proccess of combining these two equations:

v2=v1+aΔt and Δd=v1Δt+1/2aΔt2 ,

The attached is a screenshot of the course material that I need help with. It demonstrates how to combine the two equations but it seems to skip some steps that I can’t quite catch. I gathered to do so I should substitute one equation into the other, but do not know where to start. Some guidance would be greatly appreciated. Thank you

Attached Images
File Type: png combine.png (47.8 KB)

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