# Write an equation in standard form containing the given point and having the given slope

We can use that to figure out how long it will take him to save all the money he needs to buy the MP3 player.

### Write an equation in standard form with slope and point calculator

We could say b is equal to 8. Remember, the y in this equation represents the amount Andre has saved, and the x represents the number of months he has been saving. I'll just do a real rough graph. Because if you move in the positive x direction, we have to go down. If you move one in the x direction, you have to move up seven. So this is our y-intercept. So let's see, we get negative 11 is equal to 7 times negative 4 is negative 28 plus b, and now we can add a 28 to both sides of this equation. When x is 0, y is So we know m is 7, they told us that right at the beginning. So this point right over here is going to be 0, And we are done. And now we can just solve for b. So hopefully, we're a little familiar with the slope already. Notice, x is 0.

So negative 11 is equal to 7 times x-- and in this case x is negative plus b. That's not green. If you move one in the x direction, you have to move up seven. So this is our y-intercept. So the equation of any line in slope-intercept form is y is equal to mx plus b, where m is the slope and b is the y-intercept.

And our slope is 7. So we'll move down seven, so the line will look roughly like this.

And now we know b is And this actually just falls straight out of this equation. So let's say our line looks something like that. So we know m is 7, they told us that right at the beginning.

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