Book Maths Puzzle Algebra

Solving pair of linear equations by graphing
Problem is as follows
y=3x
y=x+4

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Book Other Question

I already found the x-intercepts, then I plotted them. Now how do I find where the rest of the coordinates go on the graph If a^2=b then a is the _____ of b. For instance since 5 to the second power is 25 5 is the ________25. Fill in the blanks plz