Question 685521
The slope intercept equation for a line follows y = mx + b where
m is lope and b is y intercept.
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Therefore, with m = {{{-1/2}}} and b = 3
{{{highlight_green(y=(-1/2)x + 3)}}}
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Alternatively, 
Given the y intercept, it is the point (0, 3)
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Use the slope and point within the point-slope formula of
y-y1=m(x-x1)
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y - 3 = {{{-1/2}}}(x-0)
y - 3 = {{{(-1/2)x}}}
{{{highlight_green(y=(-1/2)x+3)}}}
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