2. when solving a system by substitution, one should:
a. look for coefficients that are reciprocals
b. solve for x or y in one equation first
c. look for coefficients that are the same or opposites
d. always multiply by -1

answer:

b. solve for x or y in one equation first

isaiah walks 3 miles due north, turns and then 5 miles due east. how far is he from his starting point?

a^2 + b^2 = c^2

let c = distance from starting point.

(3)^2 + (5)^2 = c^2

9 + 25 = c^2

34 = c^2

sqrt{34} = sqrt{c^2}

sqrt{34} = c

answer: i think you should do the math and pay attention in class : )

step-by-step explanation:

that is truly what   think but if i get the answer i will