Question

1) Solve x + 2y = 50
-2x + 3y = 40
5x + 5y + 5z = 300

2) Solve x + y + z = -6
-2x – 2y – 2z = 12
5x + 5y + 5z = -30

Answer 1

Well,Well,Well.

This question is quite easy.

We should use eliminaton for this :))

Answer 2

Okay, elimination I can do. The three systems threw me off.

Answer 3

yes Elimination is the key to this question :)

Answer 4

Don't worry about that,

Multiply eq(1) by 2 and add eq(1) and (2)

x + 2y = 50
-2x + 3y = 40
5x + 5y + 5z = 300