Is the equation of a straight line with slope 2 and an intercept of (0,20).
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They are parallel.
Add the two equations you get 5y = 60 so y = 12 and x = 2
y = -2x+10
2x+y=1
4x + 2y = 20 2y = -4x + 20 y = -2x + 10.......but you may also write it as y = 10 - 2x.