4x+10=x+20 whaT WOULD BE THE ANSWER
1 answer:
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Answer (<u>assuming it can be slope-intercept form)</u>:
Step-by-step explanation:
Since we already know a point the line intersects and its slope, we can use the point-slope formula to write an equation, then convert it to slope-intercept form.
Substitute values for ,
, and
. Since
represents the slope, substitute
in its place. Since
and
represent the x and y values of one point the line intersects, use the x and y values of (6,5) and substitute them into the equation. Substitute 6 for
and 5 for
. Then, isolate y to put it into slope-intercept form and find an answer:
What I gather from the question is that has second moment
and variance
, and you're asked to find the expectation and variance of the random variable
.
From the given second moment and variance, we find the expectation of :
Expectation is linear, so
Using the same variance identity, we have
and
so that
Alternatively, we can use the identity