y equals 8x is a straight line pasing through the origin (0,0) and having a gradient (slope) of 8 (i.e. gradient = "change in y" divided by "change in x" )
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x=7 and y=4
Solving by the elimination method: x = 7 and y = 2
x=4, y=9 (4,9)
When 5x+3 = 17 then x = 2.8 Therefore when 8x-y = 3 then x = 2.8 and y = 19.4
-8x ----- 8