Question

Question 5

On problem #18, which variable will be the easiest to isolate in order to solve the system using
substitution?
A: x, in the top equation
B: y. in the top equation
C: x, in the bottom equation
D: y, in the bottom equation
Can someone please please please help me!

Answer 1

The answer is B because you would subtract 2x so the -y is by itself and then since there is a invisible -1 in front of the y you would divide everything by that -1 giving you the answer y=2x + 7 and you can just substitute that equation in for y in the bottom equation