write the equations 3x + 4y = 7;2x+9y =11 in the matrix equation form
no unwanted answers ❌
Answers
Answered by
1
Answer:
first multiply eqn 1 by 2 and eqn 2 by 3 ok
6x+8y=17
-6x+27y=27
_________
-19y=10
y=10/19 put this value in any eqn and solve
Answered by
1
Answer:
Writing the equations in matrix form, we get
[23−1−2][xy]=[711]
(i.e.,) AX=B⇒X=A−1B
where A=[23−1−2]; X=[xy] and B=[711]
To find A−1:
A=[23−1−2]
[A]=[23−1−2]=−4+3=−1=0
adjA=[−2−312]
A−1=[A]1(adjA)=−11[−2−312]=[23−1−2]
X=A−1B⇒[xy]=[23−1−2][711]
=[14−1121−22]=[3−1]
⇒x=3,y=−1
Similar questions