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Practice Question: Linear Equations

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Wize University Linear Algebra Textbook > Systems of Linear Equations (SLEs) (Linear Systems)

Basics of Systems of Linear Equations

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Practice Question: Linear Equations

Which of the following is/are linear equations in the variables 𝑥, 𝑦, 𝑧 and in 𝑎, 𝑏, 𝑐?

i. 𝑎𝑥+𝑏𝑦+𝑐𝑧=5𝑎𝑥+𝑏𝑦+𝑐𝑧=5

ii. 2𝑎2𝑥+𝑏𝑦+𝑧=52𝑎^2𝑥+𝑏𝑦+𝑧=5

iii. a2x+y+c=22\frac{a}{2}x+y+c=2^2

iv. 1ax−by+z=22\frac{1}{a}x-\frac{b}{y}+z=2^2








More Basics of Systems of Linear Equations Questions:
Which of the following is/are systems of linear equations?
a. 2𝑥1−𝑥3=𝑥22𝑥_1−𝑥_3=𝑥_2
2−𝑥3=02−𝑥_3=0
Which of the following is an equation linear in 𝑎,𝑏,𝑐?
Which of the following is an equation linear in 𝑥1, 𝑥2, 𝑥3?
Consider a system of mm linear equations in nn variables. If the solution has at least 3 parameters, then it must be true that
Which of the following is an equation linear in a, b, ca,\ b,\ c?
Which of the following is an equation linear in x1, x2, x3x_1,\ x_2,\ x_3?
linear equations
Which of the following equations is/are linear in the variables x, y, zx,\ y,\ z?
i.) 10x+20y2+30z3=010x+20y^2+30z^3=0
ii.) 2x−y3=−1−12z\sqrt{2}x-\frac{y}{3}=-1-\frac{1}{2}z
Which of the following equations is/are linear in the unknowns a,b,ca, b, c ?
i.) ax+by+cz=2ax+by+cz=\sqrt{2}
ii.) ax+2b2y+3c3z=10ax+2b^2y+3c^3z=10
Practice: Linear Equations (~2016 Test2 #1)
Practice: Linear Equations
Which of the following is/are equations linear in 𝑝, 𝑞, 𝑟? (select all that apply)
a)𝑝𝑥+𝑞2𝑦+𝑟3𝑧=3a) 𝑝𝑥 + 𝑞^2𝑦 + 𝑟^3𝑧 = 3
Practice: Linear Equations
For what value(s) of kk will the following equation be linear in x, y, zx,\ y,\ z and a, b, ca,\ b,\ c?
2x+kay−(ln⁡2)b=3−c2x+\frac{k}{ay}-\left(\ln2\right)b=3-c
Which of the following equations is/are linear in the variables x, yx,\ yand zz?
x−y+2z=0x-y+2z=0
x2+2y2+3z2=1x^2+2y^2+3z^2=1
System of Equations
e.g. True or False: if a linear system has more unknowns than equations, then it must have infinitely many solutions. Justify your answer with a proof or counter-example.
A homogeneous system (Ax⃗=0⃗A\vec{x}=\vec{0}) with mmlinear equations in nnunknowns has exactly one solution. Which of the following statements is always true?
System of Equations
e.g. True or False: if a linear system has more unknowns than equations, then it must have infinitely many solutions. Justify your answer with a proof or counter-example.
System of Equations
True or False: if a linear system has more unknowns than equations, then it must have infinitely many solutions. Justify your answer with a proof or counter-example.
Basics of Systems of Linear Equations
Which of the following are linear equations in the variables p, q, rp,\ q,\ r? [Select all that apply]
Linear algebra
For which values of aaand bbdoes the system 2x−4y=a3x−ay=3b\begin{array}{l}2x-4y = a\\3x-ay = 3b\end{array}have no solutions?
Linear Equations
Which of the following is an equation linear in a, b, ca,\ b,\ c?
Linear Equations
Which of the following is an equation linear in x1,x2,x3x_1, x_2, x_3?
Basics of Systems of Linear Equations
Determine which vectors are solutions to the following SLE [select all that apply]:
x1 − 5x2 +x3=2−x1 +5x2 −3x3= −6\begin{alignedat}{8} x_1\ &-&\ 5x_2\ &+& x_3 &=& 2\\ -x_1\ &+& 5x_2\ &-& 3x_3 &=&\ -6 \end{alignedat}