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    STEP 1) If you have two lines that intersect, you know that the coordinates will be the same in both equation at the point. Sooo you can make the equations equal to each other:

     x-5 = 3x-13

    STEP 2) Solve the equation to find the value of "x" and then plug that value of x back into one of the line equations to get the "y" coordinate. The X and Y values are the coordinates so you now have the point S.

    STEP 3) Now you have S and T you can find the equation of the line that passes through them. Do you know how to do this bit?
 
 
 
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