Question 78906
You can do this directly.  Use the slope intercept form of an equation. This form is:
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{{{y = mx + b}}}
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where m is the slope and b is the value of y where the graph crosses the y-axis.
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The problem tells you that the slope (m) is -5.  Substitute this into the slope intercept
form and you get:
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{{{y = -5x + b}}}
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and the problem also tells you that the point (0, 5) is the y-intercept.  At that point
the value of y is 5. Substitute this for b in the slope intercept equation and you get:
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{{{y = -5x + 5}}}
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That's the answer.  This equation is one that has a graph with a slope of -5 and crosses
the y-axis at +5.
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Hope this helps you to understand the slope intercept form of an equation.