if y is directly proportional to x, and y = 10 when x = 2.5 determine the value of : the constant of proportion, x when y = 20 and y when x = 1.25

hi,

i'm 75% sure the answer is 1,1 to both lines.

have a great day

hello from mrbilldoesmath!

answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

you,

mrb