Pamela's age is two times jiri's age. the sum of their ages is
54
. what is jiri's age?

P+j=54
p=2j
Use substition method
(2j)+j=54
3j=54
j=18
Jiri is 18 years old.

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!