Express it in slope-intercept form.

Step-by-step explanation:

Slope-intercept form is y = mx + b where m is the slope and b is the y-intercept. We can see that the y-int. is 1, since that's where the line hits the y-axis. For slope, use . To hit a point right above a whole number, you would have to go up for and left three, hence . Put that together and get .

where is the triangle?

you need a common difference between consecutive terms to be constant, like 1,2,3,4 or 2,4,6,8, or 1,3,6,9