Math questions how to work this. y=-1/2+5/2 this is what i came up with but it’s wrong.

You are almost right, you just forgot to put the x in. It should be -1/2x instead of just 1/2.

y = -x/2 + 5/2 or -1/2 x + 5/2 or 5/2 - x/2

x + 2y = 5


Subtract x from both sides : 

x + 2y - x =  5 - x


Combine like terms:

2y = 5 - x


Divide by 2 through:

2y ÷ 2 = (5 ÷ 2) - (x ÷ 2)


Simplify :

y = 5/2 - x/2


y = 5/2 - x/2

2m - 3

Step-by-step explanation:

Distance ran by Jim = m

Twice as far as Jim : 2 * m = 2m

3 miles fewer than '2m' = 2m - 3

Distance ran by Kelly = 2m - 3