Book Maths Puzzle Algebra

How do you solve the system of
6x-y=3
4x-2y=-2
by using the substitution method

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Book Other Question

Equation of the line that contains the points of (x,y) coordinates (-3,7) and (5,-1)? What is the correct equation format with the ordered pairs to solve for y? 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