Question 259003
Think about 
y = mx + b. and your equation
y = 0x + 2
notice that m = 0 and b = 2.
So plot a dot on the y axis at 2.
Next from the dot move 0 up and 1 right ad put another dot. 
Do this 1 more time.
You will generate a horizontal line.
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anytime they give y = b, it is horizontal.
anytime they give x = a, it is vertical
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we get a graph that looks like this
{{{ graph( 300, 200, -6, 5, -10, 10, y=2) }}}