Question 366536
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Hi, 
{{{u(x) = sqrt(-5x + 5)}}}
-5x + 5 > 0 for the square root to be a real number
-5x > -5
x < 1
graph would be an arrow from and including x=1 [pointing to the left on the number line] 
{{{number_line( 600, -10, 10, 1)}}}