So easiest way to do slope is to count rise over run. But this question is tricky because it’s not the same spaces in each increment.
Like the x is 1,2,3,4 and the y is 15,30,45,60 etc.
So the formula is y=mx+b
m stands for slope
b is for y intercept. That means what is the y when x is 0.
So first slope. m=y2-y1/x2-x1 or rise/run. Rise as in the y axis and run as in the x axis.
So let’s use the first 2 points. (0,0) (1,15)
15-0/1-0= 15/1= 15
So m=15
For b, when x is zero, y is also zero. So you would just leave that part out. I mean I guess you can put a +0 but it’s unnecessary.
So y=15x
Ps. You can also try diff points for m. 30-15/2-1 = 15/1=1 ect. Even like 60-15/4-1= 45/3 = 15