Answer:
Step-by-step explanation:
Given is the system of equations:
![7X_1 + 3X_2 = 12\\ -6x_1 - 3x_2 = 4](https://tex.z-dn.net/?f=7X_1%20%2B%203X_2%20%3D%2012%5C%5C%20-6x_1%20-%203x_2%20%3D%204)
a) Coefficient matrix is
7 3
-6 -3
b) |A|= -21+18=-3
c) Inverse =
1 --1
2 -7/3
c) Solution = product of inverse matrix * (12 4) Transpose
X1 = 16 and X2 =-100/3
Answer:
p -6= 11,
17 pairs
Step-by-step explanation:
Total pairs before giving away= p
Number of pairs given= 6
Pairs of shoes left= 11
Thus, the equation is p -6= 11.
To find the number of pairs they had initially, solve for p. This can be done by adding 6 on both sides to the equation above.
p= 11 +6
p= 17
Old canvas = x times x =100 inches
New canvas = X times 18= 180 inches