book Maths Puzzle Numerical Ability

In A.D. 1054, Chinese astronomers observed the light from a supernova in the night sky. This supernova was the incredibly powerful origin of what is now the Crab Nebula.
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How would you write an equation for a line that has an x-intercept of -1 and a y-intercept of 4? I have a very frustrated child trying to figure out simplfying and expanding. Description or easy way to do this is not so easy to understand. Can you give an explanation that I can try to help.