can you help with this

Algebra
Tutor: None Selected Time limit: 1 Day

A student is solving the system of equations below. In which line is a mistake first made?

2x + y -­ 2z = 23 

3x + 2y + z = 11 

x -­ y + z = ­-2

Line 1  z = 11 + 3x + 2y 

Line 3  ­-4x ­- 3y = 45 

Line 5  4x + y = - ­13 

Line 6  ­-2y = 32 

Jan 14th, 2015

Well, line 1 is wrong!

If you take the equation 3x + 2y + z = 11:

Subtract 3x from both sides:

2y + z = 11 - 3x

Subtract 2y from both sides:

z = 11 - 3x - 2y

This is different from z = 11 + 3x + 2y.


Hope this helps!

Jan 14th, 2015

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