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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 2 2x + y ­- 2(11 + 3x + 2y) = 23
Line 3 ­-4x ­- 3y = 45
Line 4 x -­ y + (11 + 3x + 2y) = ­- 2
Line 5 4x + y = - ­13
Line 6 ­-2y = 32
Line 7 y = ­16, x = ¾, z = ­-11/4

1 Answer

0 votes

Answer:

1st line

Explanation:

Should be z=11-3x-2y, then solve from there.

User Arsham
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