The midpoint

The midpoint of (2, 5) and (8, y) is (5, -1). Find the line equation in slope-intercept form.

Correct answer:

y =  -7
f = -2x+9

Step-by-step explanation:

y = f(x) = k x +q mx=22+8=5 my = 25+y = 1  5+y=(1) 2  y=7  y=17=7  y=7
5=k 2+q y=k 8+q 5=k 2+q (7)=k 8+q  2k+q=5 8k+q=7  Pivot:Row1Row2 8k+q=7 2k+q=5  Row282 Row1Row2 8k+q=7 0.75q=6.75  q=0.756.75=9 k=87q=879=2  k=2 q=9  f(x) = k x +q f=2x+9

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