SOLUTION: find equation of a line when slope is -2 and passing through (1,2)

Question 506432: find equation of a line when slope is -2 and passing through (1,2)
Found 2 solutions by jim_thompson5910, Sarah900:
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

y = mx+b

2 = -2(1)+b

2 = -2+b

2+2 = b

4 = b

b = 4

So the equation of the line is y = -2x+4

Let me know if you need more help or if you need me to explain a step in more detail.
Feel free to email me at jim_thompson5910@hotmail.com
or you can visit my website here: http://www.freewebs.com/jimthompson5910/home.html

Thanks,

Jim
Answer by Sarah900(12) (Show Source): You can put this solution on YOUR website!
To solve this you are going to use the formula y � y1 = m(x � x1). From there plug in what you know. m is the slope which for this problem is -2. x1 is the x coordinate of the given point. In this case its 1. And y1 is the y coordinate of the given point. In this case its 2.
y-2 = -2(x � 1)
Now simply manipulate the problem into slope intercept form
y-2=-2x+2
y=-2x+4
To check our answer you can graph it. If the line goes through the given point, then your answer is correct.
RELATED QUESTIONS
find the equation of a line with slope 1/2 and passing through the point (-4,3) (answered by checkley77)
what is the equation of the line passing through (-2, 1) and having a slope of 1/2? (answered by Alan3354)
What is the equation of the line passing through (1, 2) with a... (answered by jim_thompson5910)
What is the equation in slope-intercept form of a line passing through points (-2,-1) and (answered by stanbon)
Find the equation of a line whose slope is undefined and passing through the points (2 ,... (answered by stanbon)
find the slope of a line passing through (3,2)and... (answered by MathLover1)
Find the slope of a line passing through the points (2,4) and... (answered by Alan3354)
Find the slope of a line passing through the points (2,4) and... (answered by dv2016)
Find the equation of straight line passing through (-3,4) and its slope is 2/3.Also find... (answered by MathLover1,Fombitz)