Work with Functions and some other stuff

Question

Ok i'm a bit lazy and don't feel like typing in all this and just to avoid other stuff i'm just going to post a link to the Functions.  http://i.imgur.com/YkVtGjT.png?1?6086 http://i.imgur.com/L6KFCl3.png?1    http://i.imgur.com/QJSIjzC.png?1       It's 3 Questions                                                                                       .

Answer 1

If you inspect the y values, you will note that the y value goes up one for every value of x.

If you are already using slope, that means that the slope is 1. With slope-intercept form, you need to know two things: the slope and the y value where x = 0. Here y = 7 where x = 0.

So the formula for the line is y = x + 7.

Question B asks what is the value of y when x = 8. Just substitute x with x in the equation above and you get: y = 8 + 7. That simplifies down to y = 15.

Question C asks what is the value of x when y = 35. So to do that, we substitute y with 35:

35 = x + 7

35 - 7 = x + 7 - 7

28 = x

So when y = 35, x = 28. And there you have it!