QuestionAugust 26, 2025

What is the solution to the following linear system of equations? 2x+y=-2 -x+3y+z=16 x-2y-z=-12 A. (-3,4,1) C. Infinite Solutions B. (3,4,-1) D. No Solutions

What is the solution to the following linear system of equations? 2x+y=-2 -x+3y+z=16 x-2y-z=-12 A. (-3,4,1) C. Infinite Solutions B. (3,4,-1) D. No Solutions
What is the solution to the following linear system of equations?
2x+y=-2
-x+3y+z=16
x-2y-z=-12
A. (-3,4,1)
C. Infinite Solutions
B. (3,4,-1)
D. No Solutions

Solution
4.7(210 votes)

Answer

(-3, 4, 1) Explanation 1. Solve for x and y from the first equation From 2x + y = -2, express y = -2 - 2x. 2. Substitute y into the second equation Substitute y = -2 - 2x into -x + 3y + z = 16: -x + 3(-2 - 2x) + z = 16 \Rightarrow -x - 6 - 6x + z = 16 \Rightarrow -7x + z = 22. 3. Substitute y into the third equation Substitute y = -2 - 2x into x - 2y - z = -12: x - 2(-2 - 2x) - z = -12 \Rightarrow x + 4 + 4x - z = -12 \Rightarrow 5x - z = -16. 4. Solve the system of two equations in x and z Solve -7x + z = 22 and 5x - z = -16 simultaneously: Add the equations: -7x + z + 5x - z = 22 - 16 \Rightarrow -2x = 6 \Rightarrow x = -3. 5. Find z using x = -3 Substitute x = -3 into -7x + z = 22: -7(-3) + z = 22 \Rightarrow 21 + z = 22 \Rightarrow z = 1. 6. Find y using x = -3 Substitute x = -3 into y = -2 - 2x: y = -2 - 2(-3) \Rightarrow y = -2 + 6 \Rightarrow y = 4.

Explanation

1. Solve for $x$ and $y$ from the first equation<br /> From $2x + y = -2$, express $y = -2 - 2x$.<br />2. Substitute $y$ into the second equation<br /> Substitute $y = -2 - 2x$ into $-x + 3y + z = 16$: <br /> $-x + 3(-2 - 2x) + z = 16 \Rightarrow -x - 6 - 6x + z = 16 \Rightarrow -7x + z = 22$.<br />3. Substitute $y$ into the third equation<br /> Substitute $y = -2 - 2x$ into $x - 2y - z = -12$: <br /> $x - 2(-2 - 2x) - z = -12 \Rightarrow x + 4 + 4x - z = -12 \Rightarrow 5x - z = -16$.<br />4. Solve the system of two equations in $x$ and $z$<br /> Solve $-7x + z = 22$ and $5x - z = -16$ simultaneously:<br /> Add the equations: $-7x + z + 5x - z = 22 - 16 \Rightarrow -2x = 6 \Rightarrow x = -3$.<br />5. Find $z$ using $x = -3$<br /> Substitute $x = -3$ into $-7x + z = 22$: $-7(-3) + z = 22 \Rightarrow 21 + z = 22 \Rightarrow z = 1$.<br />6. Find $y$ using $x = -3$<br /> Substitute $x = -3$ into $y = -2 - 2x$: $y = -2 - 2(-3) \Rightarrow y = -2 + 6 \Rightarrow y = 4$.
Click to rate: