What is slop and intercept of c=5/9F-100/9

In y = mx + b form, the slope will be in the m position and the y int will be in the b position

so lets change some variables ...

y = (5/9) x + ( - 100/9)

y = mx + b

so ur slope is 5/9 and ur y int is - 100/9 or (0,-100/9)