Book Maths Puzzle Co-ordinate geometry

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

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Book Other Question

How do you solve the system of
6x-y=3
4x-2y=-2
by using the substitution method
Solving pair of linear equations by graphing
Problem is as follows
y=3x
y=x+4