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

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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.

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 y_{2}-y_{1} over x_{2}-x_{1} 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

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## Comments

y=[(1/2)(x)]+5, b=5. y-intercept is (0,5)

y=-3x+6

y=[(-1/4)(x)]-7

y=100x+300