don't worry i am not cheating you can do one or as many as you would like just right the number next to it
3. solve for y... 14.2y-12.5=6.4y-13.7
4. solve... -(-80)|-7|
5. solve for x... 5x+14-2x=9-(4x+2)
6. What is 57000/160 rounded to the nearest hundred
7. use substition to solve this 2x-y=7
and x+4y=-1
thanks you cafn do as many as u would like
2006-12-15 09:28:11 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
x+4y=-1 --------> x=-1-4y
2.(-1-4y)-y=7
-2-8y-y=7
-9y=7+2
y=-1
x+4y=-1
x-4=-1
x=3
2006-12-15 09:39:01 · answer #1 · answered by Pinar 6 · 0⤊ 0⤋
3. solve for y... 14.2y-12.5=6.4y-13.7
14,2y -6.4y =12.5 -13.7
8y= -1.2
y= - 0.15
4. solve... -(-80)|-7|
=80*7= 560
5. solve for x... 5x+14-2x=9-(4x+2)
5x -2x = 9 -14 -4x -8
5x-2x+4x =9-15-8
7x= -14
x=-2
6. What is 57000/160 rounded to the nearest hundred
356.25
7. use substition to solve this 2x-y=7
and x+4y=-1
x= -1-4y
Substitute above into 1st equation getting:
2(-1-4y) -y =7
-2 -8y -y =7
-8y-y = 7 + 2
-9y=9
y=-1
so x = -1 -4(-1)= -1 + 4 = 3
thanks you cafn do as many as u would like
2006-12-15 17:44:51 · answer #2 · answered by ironduke8159 7 · 0⤊ 0⤋
Do you have numbers 1 and 2?
3. 14.2y-12.5=6.4y-13.7
14.2y-6.4y=12.5-13.7
7.8 y = -1.2
y = -0.1538
4. -(-80)|-7| If this is the same -(-80)*|-7|
Then 80*7 = 560
5. 5x+14-2x=9-(4x+2)
5x+4x-2x=9-2-14
7x=-7
x=-1
6. 57000/160 = 356.25
7.2x-y=7
x+4y=-1
From the second equation x= -1-4y
Plug into the first one 2(-1-4y)-y = 7
From the second equation -2 - 8y -y = 7
-9y=9
y=-1
Plug into the first equation 2x-(-1)=7
2x=6
x=3
Check up:
2*3-(-1)=7
3+4*(-1)=-1
Correct
2006-12-15 17:48:54 · answer #3 · answered by Astalav 1 · 0⤊ 0⤋
3. solve for y... 14.2y-12.5=6.4y-13.7
adding 12.5
14.2y=6.4y-1.2
adding -6.4y
7.8y=-1.2
dividing by 7.8
y=-1.2/7.8
=2/13
4. solve... -(-80)|-7|
-(-80)+7
=80+7
=87
5. solve for x... 5x+14-2x=9-(4x+2)
3x+14=9-4x-2
3x+14=-4x+7
adding4x-7
7x+7=0
adding -7
7x=-7
dividing by 7
x=-1
6. What is 57000/160 rounded to the nearest hundred
5700/16
=356.25
7. use substition to solve this 2x-y=7
y=2x-7
and x+4y=-1
x+4(2x-7)=-1
x+8x-28=-1
9x-28=-1
adding 28
9x=27
dividing by 9
x=3
2006-12-15 17:38:25 · answer #4 · answered by raj 7 · 0⤊ 0⤋
3. 14.2y-12.5=6.4y-13.7 subtract 6.4y from each side
7.8y-12.5=-13.7 add 12.5 to each side
7.8y=-1.2 dividy by 7.8
y=-1.2/7=-12/78=-2/13
4. solve... -(-80)|-7|
80*7=560
5. 5x+14-2x=9-(4x+2) distribute "-: & combine like terms
3x+14=7-4x add 4x to each side
7x+14=7 subtract 14 from each side
7x=-7 divide by 7
x=-1
6. What is 57000/160 rounded to the nearest hundred
57,000/160=356.25
7. 2x-y=7 y=2x-7
x+4y=-1 substitute
x+4(2x-7)=-1 distribute 4
x+8x-28=-1 add 28 to each side & combine like terms
9x=27 divide by 9
x=3
2006-12-15 17:38:23 · answer #5 · answered by yupchagee 7 · 0⤊ 0⤋
5) 3x + 14 = 9 - 4x - 2
7x + 14 = 7
7x = - 7
x = -1
7) 8x - 4y = 28
9x = 27
x = 3
6 - y = 7
y = -1
x = 3, y = -1
If i had more time i would do all of them, sorry
2006-12-15 17:35:00 · answer #6 · answered by novadeath69 2 · 0⤊ 0⤋
I can slove number 4 for u the answer is -560
2006-12-15 17:34:21 · answer #7 · answered by moh_siryani 1 · 0⤊ 0⤋
3) Move everything to one side of the equals & change the sign of one side. 14.2y- 12.5 -6.4y+ 13.7=0
7.8y+1.2=0
7.8y= -1.2
divide both sides by 7.8
y=-0.154
2006-12-15 18:00:30 · answer #8 · answered by Just me 5 · 0⤊ 0⤋
3) 14.2y-12.5=6.4y-13.7
+ 12.5= + 12.5
14.2y= 6.4y-1.2
7.8y = -1.2
y = -6.5
5) x=-1
2006-12-15 17:43:32 · answer #9 · answered by kemi a 2 · 0⤊ 0⤋