y = 3x - 8 if y is -2 x is???
y= 3x - 8 if y is -1 x is???
y= 3x - 8 if y is 0 x is???
y=3x - 8 if y is 1 x is???
y = 3x -8 if y is 2 x is ???
2007-02-11 04:47:01 · 8 answers · asked by chickiejam 1 in Science & Mathematics ➔ Mathematics
1. Find "x" when y = -2 with y = 3x - 8
First: replace "-2" with the y-variable....
- 2 = 3x - 8 Or, 3x - 8 = -2
Sec: add 8 with both sides....
3x - 8 + 8 = -2 + 8
3x = 6
Third: isolate "x" on one side --- divide both terms by "3"...
3x/3 = 6/3
x = 2
2. Find "x" when y = -1 with y = 3x - 8
First: replace "-1" with the y-variable....
- 1 = 3x - 8 Or, 3x - 8 = -1
Sec: add "8" with both sides....
3x - 8 + 8 = -1 + 8
3x = 7
Third: isolate "x" on one side --- divide both terms by "3"...
3x/3 = 7/3
x = 7/3
3. Find "x" when y = 0 with y = 3x - 8
First: replace "-2" with the y-variable....
0 = 3x - 8 Or, 3x - 8 = 0
Sec: add "8" with both sides....
3x - 8 + 8 = 0 + 8
3x = 8
Third: isolate "x" on one side --- divide both terms by "3"...
3x/3 = 8/3
x = 3/8
4. Find "x" when y = 1 with y = 3x - 8
First: replace "-2" with the y-variable....
1 = 3x - 8 Or, 3x - 8 = 1
Sec: add "8" with both sides....
3x - 8 + 8 = 1 + 8
3x = 9
Third: Isolate "x" on one side --- divide both sides by "3"...
3x/3 = 9/3
x = 3
5. Find "x" when y = 2 with y = 3x -8
First: replace "-2" with the y-variable....
2 = 3x - 8 Or, 3x - 8 = 2
Sec: add "8" with both sides....
3x - 8 + 8 = 2 + 8
3x = 10
Third: isolate "x" on one side --- divide both terms by "3"...
3x/3 = 10/3
x = 10/3
2007-02-11 05:24:05 · answer #1 · answered by ♪♥Annie♥♪ 6 · 1⤊ 0⤋
a) Simplifying
3x + -8 = -2
Reorder the terms:
-8 + 3x = -2
Solving
-8 + 3x = -2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '8' to each side of the equation.
-8 + 8 + 3x = -2 + 8
Combine like terms: -8 + 8 = 0
0 + 3x = -2 + 8
3x = -2 + 8
Combine like terms: -2 + 8 = 6
3x = 6
Divide each side by '3'.
x = 2
Simplifying
x = 2
b) Simplifying
3x + -8 = -1
Reorder the terms:
-8 + 3x = -1
Solving
-8 + 3x = -1
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '8' to each side of the equation.
-8 + 8 + 3x = -1 + 8
Combine like terms: -8 + 8 = 0
0 + 3x = -1 + 8
3x = -1 + 8
Combine like terms: -1 + 8 = 7
3x = 7
Divide each side by '3'.
x = 2.333333333
Simplifying
x = 2.333333333
c) Simplifying
3x + -8 = 0
Reorder the terms:
-8 + 3x = 0
Solving
-8 + 3x = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '8' to each side of the equation.
-8 + 8 + 3x = 0 + 8
Combine like terms: -8 + 8 = 0
0 + 3x = 0 + 8
3x = 0 + 8
Combine like terms: 0 + 8 = 8
3x = 8
Divide each side by '3'.
x = 2.666666667
Simplifying
x = 2.666666667
d)Simplifying
3x + -8 = 1
Reorder the terms:
-8 + 3x = 1
Solving
-8 + 3x = 1
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '8' to each side of the equation.
-8 + 8 + 3x = 1 + 8
Combine like terms: -8 + 8 = 0
0 + 3x = 1 + 8
3x = 1 + 8
Combine like terms: 1 + 8 = 9
3x = 9
Divide each side by '3'.
x = 3
Simplifying
x = 3
e) Simplifying
3x + -8 = 2
Reorder the terms:
-8 + 3x = 2
Solving
-8 + 3x = 2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '8' to each side of the equation.
-8 + 8 + 3x = 2 + 8
Combine like terms: -8 + 8 = 0
0 + 3x = 2 + 8
3x = 2 + 8
Combine like terms: 2 + 8 = 10
3x = 10
Divide each side by '3'.
x = 3.333333333
Simplifying
x = 3.333333333
2007-02-11 14:40:38 · answer #2 · answered by SHIBZ 2 · 1⤊ 0⤋
What you do is plug in the numbers for y:
1)If y=-2:
-2=3x-8
3x=6
x=2
(2,-2)
2)If y=-1:
-1=3x-8
3x=7
x=7/3
(7/3,-1)
3)If y=0:
0=3x-8
3x=8
x=8/3
(8/3,0)
4)If y=1:
1=3x-8
3x=9
x=3
(3,1)
5)If y=2:
2=3x-8
3x=10
x=10/3
(10/3,2)
I hope this helps and good luck with your class!
2007-02-11 12:56:05 · answer #3 · answered by Anonymous · 0⤊ 0⤋
if y = 3x - 8
so y = 3(-2) - 8
y = -6 - 8
y = -14
if y = 3x - 8
so y = 3(-1) - 8
y = -3 - 8
y = -11
if y = 3x - 8
so y = 3(0) - 8
y = 0 - 8
y = -8
if y = 3x - 8
so y = 3(1) - 8
y = 3 - 8
y = -5
if y = 3x - 8
so y = 3(2) - 8
y = 6 - 8
y = -2
2007-02-11 13:02:31 · answer #4 · answered by Anonymous · 0⤊ 1⤋
y=3x-8 , y=-2
You equate them i.e
3x-8=-2
3x=-2+8
3x=6
x=6/3
x=2
And continue for the others
Good Luck
2007-02-11 12:53:48 · answer #5 · answered by Natesha A 1 · 3⤊ 0⤋
y = 3x - 8
y= 3(-2) - 8
y = -6 - 8
y = -14
y = 3x - 8
y = 3(-1) - 8
y = -3 - 8
y = -11
y= 3x - 8
y = 3(0) - 8
y = 0 - 8
y = -8
y= 3x - 8
y = 3(1) - 8
y = 3 - 8
y = -5
y= 3x - 8
y = 3(2) - 8
y = 6 - 8
y = -2
2007-02-11 12:52:07 · answer #6 · answered by 7 · 3⤊ 1⤋
Just sub in the values
2007-02-11 12:49:45 · answer #7 · answered by Mysterioussurfer 1 · 2⤊ 0⤋
x = (y + 8)/3
now substitute the values for y to get x.
2007-02-11 12:52:09 · answer #8 · answered by rscanner 6 · 2⤊ 0⤋