HSC Science (Electronics) 12th Board ExamMaharashtra State Board
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Solution - If a=i+2j, b=−2i+j, c=4i+3j , find x and y such that c=xa+yb - HSC Science (Electronics) 12th Board Exam - Mathematics and Statistics

Question

If `bara=bari+2barj, barb=-2bari+barj,barc=4bari+3barj`,  find x and y such that `barc=xbara+ybarb`

 

Solution

Given that  `veca = hati +2hatj, vecb = −2hati +hatj, vecc = 4hati + 3hatj`

We need to find x and y such that `vecc = xveca + yvecb`

Substituting the values of a, b and c, in ` vec c = xveca + yvecb`, we have,

`4hati + 3hatj = x(hat i +2hatj )+ y (-2hati +hatj)`

`4hati + 3hatj = (x -2y)hat i + (2x + y) hatj`

Comparing the coefficients of i and j on both the sides, we have,
x-2y= 4
and
2x + y = 3
Solving the above simultaneous equations, we have,
x = 2 and y = -1

  Is there an error in this question or solution?

APPEARS IN

 2014-2015 (March) (with solutions)
Question 1.2.5 | 2 marks

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Solution for question: If a=i+2j, b=−2i+j, c=4i+3j , find x and y such that c=xa+yb concept: null - Linear Combination of Vectors. For the courses HSC Science (Electronics), HSC Science (Computer Science), HSC Science (General) , HSC Arts
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