Question

1) Solve the following system of linear equations using the substitution method. Be sure to explain all steps:
-x + y = 3
2x + y = 9

Answer 1

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Step 1. Solve the first equation for y.
y = 3 + x
Step 2. Substitute that value in for y in the second equation and solve for x.
2x + (3 + x) = 9
3x + 3 = 9
3x = 6
x = 2 <---
Step 3. Substitute the value of x into the first equation and solve for y.
-(2) + y = 3
y = ? <---

Answer 2

y =-1.5

Answer 3

Actually, you want to add 2 to both sides to finish solving for y. :)
-2 + 2 + y = 3 + 2
0 + y = 3 + 2
y = 3 + 2
y = ?

Answer 4

oh 5

Answer 5

You've got it! ^_^

Answer 6

awesome thank you so much!!!

Answer 7

No problem :D