posted by sue on .
Solve the system of equations by Elimination OR Substitution. Explain why you chose one method over the other.
3x – 2y = 8
2x + 5y = -1
I would only use substitution if I can isolate one of the variables without having to go into fractions.
In this case I would use elimination.
multiply the first by 5 and the second by 2, then add them :
15x - 10y = 40
4x + 10y = -2
19x = 38
x = 2
now sub that back into one of the originals. Take it from here.