Question

http://prntscr.com/5cfgqm

@iGreen @texaschic101 @ganeshie8 @Directrix @dan815 @phi @uri @sammixboo @Jhannybean

Answer 1

Take any two points and find the slope.

Let's take (1, 2) and (2, 7).

Plug them into the slope formula:

\(m = \dfrac{y_2-y_1}{x_2-x_1}\)

\(m = \dfrac{7-2}{2-1}\)

Subtract:

\(m = \dfrac{5}{1}\)

Can you divide that? @iKayla

Answer 2

Divide which ones?

Answer 3

5 / 1

Answer 4

5 / 1 = 5

Answer 5

Yep, so we know that the slope is 5.

Slope-intercept form:

y = mx + b

Where m = slope.

So we have y = 5x + b so far.

Answer 6

To find the y-intercept we can plug in one point and plug in the slope into the point-slope form.

\(y - y_1 = m(x - x_1)\)

Where \(m\) is slope, \(y_1\) is the y-value, and \(x_1\) is the x-value.

We can plug in (1, 2), and the slope, 5.

\(y - 2 = 5(x - 1)\)

Now we solve for \(y\).

Distribute 5 into the parenthesis:

\(y - 2 = 5x - 5\)

Add 2 to both sides, what's -5 + 2?

Answer 7

@iKayla

Answer 8

i grren can u help me with my problem it at the top

Answer 9

Sorry, I was doing something. But the answer is -4.

Answer 10

No, check again.

Answer 11

You asked what was -5 + 2. OH! I see. The asnwer is -3.

Answer 12

I mistyped.

Answer 13

Yes, so that gives us:

\(y = 5x - 3\)

So there's your answer!

A slope of 5, and a y-intercept of -3.

Answer 14

But the equation on the screenshot is using plus instead of subtraction.

Answer 15

So, is this right? http://prntscr.com/5cfn0r

Answer 16

?? @iGreen