What number is needed to complete the pattern below 5 10 3 15 20 13 25 30 ?

The pattern
5 10 3 15 20 13 25 30
the next number is
23 because after each 2 numbers its +10 

Hope this helps,
xXharleyquinn04Xx

Abit confused about what you mean, but i think you might be referring to slope intercept form: y = mx + bin that case b, or the y intercept is already given.(0,-1)find the slope by using the formulay2 - y1/x2 - x1the final slope will be 4/2, equivalent to 2.now your equation should look like thisy = 4/2x -1sorry if this didn’t you out!

Idon’t know how to do that