Answer:
b= -7
Explanation:
First set up the equation y=mx+b.
The add what you know, so that:
y=2/5x+b
Now plug in (10,-3) to the equation to find b.
-3=2/5(10)+b
Simplify (2/5 * 10= 4)
-3=4+b
Get b alone by substracting four to each side.
b =-7
*I recommend checking my work, but this is what I put.