Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
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Question 1
For which values of a will the following system have no solutions? Exactly one
solution? Infinitely many solutions?
x + 2y - 3z = 4
Зх - у + 5z 3D 2
4х + у + (а? — 14)z — а + 2
Question 2:
Find A-1 using row operations or adjoint method.
-1
2 6
A =| 2
6
1
6 4]
Question 3
Prove the identity without evaluating the determinant (Using properties).
a1 b1 + tai ci+rb1 + sa1
a2 b2 + taz c2+rb2+ saz= b1 b2 b3
a3 b3 + taz c3 + rb3 + saz
a1 a2 a3
C1 c2 c3
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