Question 377053
Substitute what you know to "fill in the blanks."
The slope = -2, so that is the coefficient of 'x'.
The y-intercept is the point where x=0.
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Slope-intercept form:  y = mx+b
y = -2x -3
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Standard form:  Ax + By = C.
Add 2x to both sides to get 'x' and 'y' to the same side, leaving the constant behind.
2x + y = -3
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A graph is useful, too.
{{{graph(500,500,-10,10,-10,10,-2*x-3)}}}
Done.