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the ? below finding slope and y intercept

how do you find slope and y intercept if the formulas y=mx+b i need help i have a quiz and could you test me on one and put the answer in the comment box
 

Comments

s=slope
y=yintercept
s=2
y=-1
s=1/2
y=5
s=3
y6
s=-1/4
y=-7
s=100
y=300
thanks me vivian
 
 
One mistake...
y=-3x+6
slope is -3.
Now you know that your weakness is identifying negative signs.  Please watch for that on the quiz.
Otherwise...
y=mx+b
m is the slope.
b is y-intercept, the value of y when x=0.
Instead of using s and y, it would be better to use m and b.  I assume this is what your instructor will want.
 
Furthermore, the y-intercept is a coordinate.
y=2x-1, b=-1, y-intercept is (0,-1).
y=[(1/2)(x)]+5, b=5.  y-intercept is (0,5)
y=-3x+6
y=[(-1/4)(x)]-7
y=100x+300
 
 
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2 Answers

Hi Sarha;
Find the slope and y-intercepts of the following equations...
 
y=2x-1
y=[(1/2)(x)]+5
y=-3x+6
y=[(-1/4)(x)]-7
y=100x+300
 
Please place your answers in a comment and I will evaluate.

Comments

hey thanks um what dose it mean if theres bars around the number |1| like this what dose that mean
 
Hi Sarha;
These are brackets...[ ].
I had two sets of parentheses side-by-side, ( ) ( ).  I therefore wrapped these in brackets...[( ) ( )].
 
Slope is the change in y divided by the change in x so it would be y2-y1 over x2-x1 given by the two coordinates that you have.
 
So if your points are (1,2) and (3,4) it would be (4-2)/(3-1) = 2/2 = 1
So your slope would be 1
 
To find Y, you plug in one of the points that you were given then you isolate B.
So if the point was (1,2) with m=2 you would solve:
 
y = mx + b
 
2 = 2(1) + b
2 = 2 + b
0 = b