Answer:
pretty sure is accociatve property
Bx + Cy = D
Solve for y . . .
*subtract Bx from both sides
Bx - Bx + Cy = D - Bx
Cy = D - Bx
*now divide both sides by C
Cy/C = (D - Bx)/C
Cy/C = D/C - Bx/C
y = D/C - (B/C)x
<u><em>y = -(B/C)x + D/C</em></u>
X+(x-5) +(x-10) ...
This adds up to 8x -140 seconds where x is the 1st race time.
This adds up to 44:20 minutes
44mins * 60 sec/min = 2640 seconds + 20 = 2660 seconds cummulative
8x - 140 = 2660 8x =2800 sec
8x = 350 seconds or 4.5mins for the 1st race
Race 2: subtract 5 seconds yields 4 mins 25 seconds
Answer:
B.
Step-by-step explanation:
The given matrix is
The determinant of this matrix is
Since the determinant is not zero, it means the inverse exists.
The inverse is given by
The correct choice is B.