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how to find slope and y-intercept of y=3x-5

I don't know how to find the slope and y-intercept of the equation y=3x-5. I also need help a faction one. The equation is y= -2/3x + 4 ( / = divided). I need to state the slope and y-intercept.

   Then I have to graph the answer.
asked Aug 13, 2011 in Algebra 2 Answers by anonymous




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5 Answers

Any line equation which is in the form y=m*x + b is called slope-intercept form. What that gives you is the slope is the number which is multiplied by X (called the coefficient) while the slope intercept is the Y value when X=0.

So if we take your first equation: y = 3x - 5

The slope (or m) = 3

The Y intercept = -5

Slope is defined as either "the change in y divided by the change in x" or "rise over run", so that 3, really can be considered as 3/1. Each change in X of 1 will change Y by 3. So slope = 3/1.

Graphing any line can come from 2 methods. 1) create a table of values or 2) calculate a single point (x,y) and then apply the slope to find a second coordinate pair (x,y).

For the equation y=3x - 5:

y = 3x - 5
x y
0 -5
1 -2

Replacing the values for X into the original equation, will come out to the values for Y. So when X=0, y = 3*0 - 5, or simply -5. 

When X = 1, Y = 3*1 -5 or simply -2.

With these two coordinate pairs of points, you can plot a dot on your graph at each (0,-5) and (1, -2) then draw a straight line which goes through each point and continues straight in each direction, probably ending each end of this line with an arrow to show it continues. I do not have a way to include a picture here of a graph.

The second way to graph a line is as follows. You need a starting point that will be on the line. Given the form of y=mx + b, you have a simple point which can be used at the y-intercept. The point is always in the form of (0, b), so in this case it is (0,-5). From that first point, you will apply your slope. The slope is 3 (or technically 3/1 which is a big help). From the initial point (0,-5) you will go UP 3 and RIGHT 1 and that will be the next point that is easy to find. Connect those two points and continue the line in each direction and that will be a graph of your line.

Anytime your slope is positive, you will use it by going UP the top number (numerator of the slope) and going RIGHT the bottom number (denominator of the slope). But if your slope is negative (like your second problem is) you will use it by going DOWN the numerator and then RIGHT the denominator.

The equation is y= -2/3x + 4 ( / = divided). I need to state the slope and y-intercept.

I will not walk through the details on the second equation, but you should have enough information to get the answer from the above example.

answered Aug 14, 2011 by anonymous
x(x)+2x=35   how does x=5?
answered May 21, 2012 by anonymous

2+2
=4 because we are adding that means to plus

 

answered Oct 5, 2012 by anonymous
what is 14x4
answered Dec 7, 2012 by anonymous
6y= -5x +24
answered Oct 10, 2013 by JOHN

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