-5x+y=-4 in function form
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<span>The derivative of a function at a point gives the slope of the line tangent to the function's graph at that point.
</span>Therefore,
gives the slope of the tangent line to the graph of 
where 
, which is the point 
.
We know this line passes through , and we are also given that it passes through 
. <span>This should be enough to find the slope of that line.
</span>
In conclusion,
</span>Therefore,
We know this line passes through
</span>
In conclusion,