A.2.D.10.21TN
Answer to Problem 21:
(4, -1)
|
Multiply the first equation [2x – 3y = 11] by –2 |
|
-4x + 6y |
= |
-22 |
|
2nd equation [4x + 5y = 11] |
|
4x + 5y |
= |
11 |
|
Add |
|
11y |
= |
-11 |
|
|
|
y |
= |
-1 |
|
|
|
|
|
|
|
Replace y = -1 into an original equation |
|
4x + 5(-1) |
= |
11 |
|
|
|
4x + -5 |
= |
11 |
|
|
|
4x |
= |
16 |
|
|
|
x |
= |
4 |