Weegy: Did you mean the determinant of coefficients?
2 -1
1 3
determinant = 2(3) - (-1)(1) = 6+1=7 source: yahoo
User: Solve the system algebraically.
4x - 5y = 3
x = 3 -1/2 y
What is the value of x?
9/7
24/14
33/14
Weegy: 9/7
User: A boat makes a 120-mile trip downstream in 3 hours but makes the return trip in 4 hours. If b = the rate of the boat in still water and c = the rate of the current, which of the following equations represents the trip upstream?
3(b - c) = 120
4(b - c) = 120
4(b + c) = 120
Weegy: A.3(b - c) = 120
User: 2x - y = 5
x + 3y = 7
What is the value of the y-determinant?
7
9
22
Weegy: Did you mean the determinant of coefficients?
2 -1
1 3
determinant = 2(3) - (-1)(1) = 6+1=7 source: yahoo
User: A boat makes a 120-mile trip downstream in 3 hours but makes the return trip in 4 hours. What is the rate of the current?
3 mph
4 mph
5 mph
Weegy: 4 mph is the rate of the current if A boat makes a 120-mile trip downstream in 3 hours but makes the return trip in 4 hours. Sol'n: d=vt; v1t1 = v2t2; v2 = (120(3))/4; v2 = 90; Delta V = 120 - 90; Delta V = 30; rate of current = 120/30; rate of current = 4mph
User: Solve the system algebraically.
2x+ y - 10 = 0
x - y - 4 = 0
What is the value of y?
1/3
2/3
14/3
Weegy: CAN YOU REWORD YOU QUESTION
User: Solve the system algebraically.
2x+ y - 10 = 0
x - y - 4 = 0
What is the value of y?
Weegy: 2x + y - 10 = 0
2x = 10 - y
x = (10 - y)/2
x - y - 5 = 0
x = y + 5
Value of y:
2(y + 5) = 10 - y
2y + 10 = 10 - y
3y = 0
y = 0
User: x - 2y = 3
5x + 3y = 2
The lines whose equations are shown intersect at which point?
(1, -1)
(-1, 1)
(0, 3/2)
User: 2x - y = 5
x + 3y = 7
What is the value of the system determinant?
5
6
7
Weegy: Did you mean the determinant of coefficients?
2 -1
1 3
determinant = 2(3) - (-1)(1) = 6+1=7 source: yahoo
User: One number is 7 more than twice another. If their difference is 22, what is the larger number?
29
37
43
Weegy: : ...
(More) 5
3(2x - 3) + 4(2 - x) = 0
6x - 9 + 8 - 4x = 0
2x - 1= 0
2x = 1
x =1/2
Added 10/8/2014 11:00:04 PM
5
7x - 3x is the algebraic expression for "the difference between seven times a number and three times that number .
Added 10/8/2014 11:04:35 PM
5
A man invests a certain amount of money at 2% interest and $800 more than that amount in another account at 4% interest. At the end of one year, he earned $92 in interest. The money was invested in each account is $1,000 at 2%; $1,800 at 4% .
Let the money at 2% interest is x ,
2%*x + ( x + 800)*4% = 92
0.02x + 0.04x + 32 = 92
0.06x = 60
x = 1000,
the money at 4% interest is 1000 + 800 = 1800
Added 10/8/2014 11:09:59 PM
5
The second row of entries for the system determinant for 2x - y = 5, x + 3y = 7 is 1 ,3 .
Added 10/8/2014 11:15:35 PM
5
The value of determinant for 2x - y = 5 , x + 3y = 7 is 7 .
2*3 - (-1)*1 = 6 + 1 = 7 .
Added 10/8/2014 11:15:56 PM
