Description
QUESTION 1
2 points
QUESTION 2
2 points
QUESTION 3
2 points
QUESTION 4
2 points
QUESTION 5
2 points
QUESTION 6
2 points
QUESTION 7
2 points
QUESTION 8
2 points
QUESTION 9
2 points
QUESTION 10
2 points
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QUESTION 1
2 points
QUESTION 2
2 points
QUESTION 3
2 points
QUESTION 4
2 points
QUESTION 5
2 points
QUESTION 6
2 points
QUESTION 7
2 points
QUESTION 8
2 points
QUESTION 9
2 points
QUESTION 10
2 points
QUESTION 11
2 points
QUESTION 12
2 points
QUESTION 13
2 points
QUESTION 14
2 points
QUESTION 15
2 points
QUESTION 16
2 points
QUESTION 17
2 points
QUESTION 18
2 points
QUESTION 19
2 points
QUESTION 20
2 points
QUESTION 21
2 points
QUESTION 22
2 points
QUESTION 23
2 points
QUESTION 24
2 points
QUESTION 25
2 points
QUESTION 26
2 points
QUESTION 27
2 points
QUESTION 28
2 points
QUESTION 29
2 points
QUESTION 30
2 points
QUESTION 31
2 points
QUESTION 32
2 points
QUESTION 33
2 points
QUESTION 34
2 points
QUESTION 35
2 points
QUESTION 36
2 points
QUESTION 37
2 points
QUESTION 38
2 points
QUESTION 39
2 points
QUESTION 40
2 points
QUESTION 41
2 points
QUESTION 42
2 points
QUESTION 43
2 points
QUESTION 44
2 points
QUESTION 45
2 points
QUESTION 46
2 points
QUESTION 47
2 points
QUESTION 48
2 points
QUESTION 49
2 points
QUESTION 50
2 points
Explanation & Answer
Attached.
QUESTION 1
1. Solve 3x – y + 2z = 6
-x + y = 2
x – 2z = –5
Answer:
Add the first equation to the third equation we have
3x-y+2z+x-2z=6-5 combine like term then 4x-y=1
Add this equation to the second equation we have:
4x-y-x+y=1+2 then 3x=3 then x=1
Plug x=1 into the second equation we have:
-1+y=2 then y=3
Plug x=1 into the third equation we have
1-2z=-5 then z=3
Final we can say the solution is (x, y, z) = (1, 3, 3)
(x,y,z)
(-1, -3, -3)
(1, 3, 3)
(1, -3, -3)
(1, 3, -3)
2 points
QUESTION 2
1. Solve 2x + y + z = 5
4x – 2y – z = 0
3x – y + 2z = 6
Answer:
Add the first equation to the second equation we have
2x+y+z+4x-2y-z=5+0 combine like term then 6x-y=5 then y=6x-5
Multiply both side of the second equation by 2 and add to the third equation we have:
8x -4y-2z+3x-y+2z=0+6 then 11x-5y=6
Plug y = 6x-5 into the equation 11x-5y =6 we have:
11x-5(6x-5)=6 then 11x-30x+25=6 then x=1
Plug x=1 into the equation y = 6x-5 we have:
y=6*1-5 =1
Plug x=1 and y=1 into the first equation we have:
2*1+1+z=5 then z=2
Final we can say the solution is(x, y, z) = (1, 1, 2)
2.
(x,y,z)
(1, 1, 2)
(-1, -1, -2)
(5, 0, 6)
(1, 1, -2)
2 points
QUESTION 3
Solve 5x + 2y – 3z = 4
-2x – 4y + z = -8
x+y+z=2
Answer:
Subtract the second equation to the third equation we have
-2x-4y+z-x-y-z=-8-2 combine like term then -3x-5y= -10
Multiply both side of the third equation by 3 and add to the first equation we have:
3x+3y+3z+5x+2y-3z=6+4 then 8x+5y=10
Add the equation 3x-5y= -10 to the equation 8x+5y=10 we have
3x-5y+8x+5y=-10+10 then 11x=0 then x=0
Plug x=0 into the equation 8x +5y=10 we have:
8*0+5y=10 then y=2
Plug x=0 and y=2 into the third equation we have:
0+2+z=2 then z=0
Final we can say the solution is: (x, y ,z)=(0, 2, 0)
1.
(x,y,z)
2 points
(2, 0, 0)
(0, 2, 0)
(2, -2, 0)
(0, -6, 9)
QUESTION 4
Solve 4x + y + z = 1
8x – 4y – 7z = 2
–5y – 9z = –33
Answer:
Multiply both side of the first equation by 2 and subtract to the second equation we have:
8x+2y+2z-8x+4y+7z=2-2 then 6y+9z=0
Add the equation 6y+9z=0 to the third equation we have:
6y+9z-5y-9z=0-33 then y=-33
Plug y=-33 into the equation 6y+9z=0 we have:
6*(-33)+9z=0 then z=22
Plug y=-33 and z=22 into the first equation we have:
4x-33+22=1 then x=3
Final we can say the solution is: (x, y, z) = (3, -33, 22)
1.
(x,y,z)=
(3, -33, 22)
(1, 2, 3)
(-3, 0.5, 2)
(0.5, 3, 2)
2 points
QUESTION 5
Solve 2x + y – z = 3
4x – y + 4z = 0
-3y + 2z = 6
Answer:
Multiply both side of the first equation by 2 and subtract to the second equation we have:
4x+2y-2z-4x+y-4z=6-0 then 3y-6z=6
Add the equation 3y-6z=6 to the third equation we have:
3y-6z-3y+2z=6+6 then -4z=12 then z=-3
Plug z=-3 into the equation 3y-6z=6 we have:
3y-6*(-3) = 6 then y=-4
Plug y=-4 and z=-3 into the first equation we have:
2x-4+3=3 then x=2
Final we can say the solution is: (x, y, z) = (2, -4, -3)
1.
(x,y,z)
(2, -4, -3)
(-2, 4, 3)
(4, 2, -7)
(-4, -2, 7)
2 points
QUESTION 6
Solve 4x + y – 2z = 0
2x – 3y + 3z = 9
-6x – 2y + z = 0
Answer:
Multiply both side of the third equation by 2 and add to the first equation we have:
-12x-4y+2z+4x+y-2z=0+0 then -8x-3y=0
Multiply both side of the third equation by 3 and subtract to the second equation we have:
-18x-6y+3z-2x+3y-3z=0-9 then -20x-3y=-9
Subtract the equation -8x-3y=0 to the equation-20x-3y=-9 we have:
-8x-3y+20x+3y=0+9 then 12x=9 then x=3/4
Plug x=3/4 into the equation -8x-3y=0 we have:
-8*(3/4)-3y=0 then y=-2
Plug x=3/4 and y=-2 into the first equation we have:
4*(3/4)-2-2z=0 then z=1/2
Final we can say the solution is: (x, y, z)=(3/4,-2,1/2)
1.
(0, 9, 0)
(0, -9, 0)
(x,y,z)
2 points
QUESTION 7
Solve x + 3y + 4z =0
x – 2z = 8
y+z=3
Answer:
Subtract the first equation to the second equation we have:
x+3y+4z-x+2z=0-8 then 3y+6z=-8 then y+2z=-8/3
Subtract the equation y+2z=-8/3 to the third equation we have:
y+2z-y-z=-8/3-3 then z=-17/3
Plug z=-17/3 into the equation x – 2z = 8we have:
x – 2*(-17/3) = 8 then x=-10/3
Plug z=-17/3 into the equation x+y=3 we have:
y-17/3=3 then y=26/3
Final the solution is: (x,y,z)=(-10/3, 26/3, -17/3)
(x,y,z)
2 points
QUESTION 8
1. Twice the first number is eleven more than the sum...