Write equation of the line passing through those two points using the point-slope formula y-y1=m(x-x1) Show all your work remember to find the slope of the line first. The numbers are (4.2 and 4.7) and (7.2 and 7.9)

Please help ME, i need an answer as fast as you can !

Question

Write equation of the line passing through those two points using the point-slope formula y-y1=m(x-x1) Show all your work remember to find the slope of the line first. The numbers are (4.2 and 4.7) and (7.2 and 7.9)

Please help ME, i need an answer as fast as you can !

anonymous · Answer

You mean coordinates? Not numbers?

Anyway.
Points (4.2, 4.7) & (7.2, 7.9)
M = y2-y1/ (x2-x1)
= (7.9 - 4.7) / (7.2 - 4.2) = 3.2/3
M = 3.2/3
Now to find C, sub in one pair of points. e.g (4.2, 4.7) as 4.2 = x and 4.7 = y
Equation of a straight line : y=mx+c
4.7=(3.2/3)(4.2) + c
4.7 = 4.48 + c
c = 0.22

Now rewrite the equation of a straight line as

y = (3.2/3)x + 0.22



I think that is right?

anonymous · Answer

yes, thank you verymuch man a big medal goes for you :)

anonymous · Answer

Okay and don't forget you can substitute in either coordinates, usually I just substitute in what ever doesn't contain a negative number. Just because it's easier. :)