maths

find the inverse of matirx m= 2 1
-1 3
is it 3 -1
1 2
and how dod i find the value of and a y for which ma is x and y

1. 👍 0
2. 👎 0
3. 👁 164
1. If you multiply
2 1
-1 3 by

3 -1
1 2 you get

7 0
0 7

So divide each of the entries in your inverse matrix by 7

in general for the inverse of
a b
c d

you would have

d -b
-c a with each term divided by (ad-bc)

1.

1. 👍 0
2. 👎 0

Similar Questions

1. Calculus, check my answers, please! 3

Did I get these practice questions right? 1. Suppose that f is an even function whose domain is the set of all real numbers. Then which of the following can we claim to be true? ***The function f has an inverse f –1 that is

2. Calculus Help

The formula C =5/9(F − 32), where F ≥ −459.67, expresses the Celsius temperature C as a function of the Fahrenheit temperature F. Find a formula for the inverse function. What is the domain of the inverse function? (Enter

3. Functions - math

The function f is such that f(x) = a^2x^2 - ax + 3b for x

4. Functions - math

The function f is such that f(x) = 2x + 3 for x ≥ 0. The function g is such that g(x)= ax^2 + b for x ≤ q, where a, b and q are constants. The function fg is such that fg(x)= 6x^2 − 21 for x ≤ q. i)Find the values of a

1. math

The cost of producing q articles is given by the function C=f(q)=100+2q. (A) Find the formula for the inverse function. (B) Explain in practical terms what the inverse function tells you. I am pretty sure the answer to A is

2. Precalculus

Find the inverse of g(x)=(1/3x)-7 and then find its domain and range. I already found the inverse of the function.

3. College Alg

Find the inverse function of f. f(x) = 36 − x2 , 0 ≤ x ≤ 6 I can't seem to find this inverse, someone help please?

4. precalculus

Find the function g(x) and its inverse given g(4) = -2 Is this even enough info to find the function and inverse?

1. Algebra

Myra uses an inverse variation function to model the data for the ordered pairs below. (2, 30), (3, 20), (4, 15), (5, 12), (6, 10) Which statement best explains whether an inverse variation function is the best model for the data?

2. Algebra

Dan works at a hardware store. The employee discount is determined by the formula d = 0.15 (c − 10 ). Use the inverse of this function to find the cost of the item for which Dan received an \$18.00 discount. a. Find the inverse

3. inverse

If f(x)=cosx + 3 how do I find f inverse(1)? Thanks y = cos(x) + 3 the inverse of this is x = cos(y) + 3 solve for y and you have your inverse The cos function only has a range of [-1,1], so the range of f(x) is [2,4]. this means

4. Algebra

what is the inverse of the linear parent function? How would you graph the inverse and what are the values for the inverse???