Question 700783: How do I find y for this equation? 2x-y=1 I don't understand how to solve it and then graph it along with y=-3.
Found 5 solutions by jpvn2015, KMST, ankor@dixie-net.com, Killjoy club, ikleyn:
Answer by jpvn2015(54)   (Show Source):
Answer by KMST(5328)  (Show Source):
You can put this solution on YOUR website! ONE WAY TO FIND  :
 -->  -->  -->  -->  --> 
ANOTHER WAY:
-->  -->  -->  -->  -->
Using  you can calculate the coordinates of two points on the line,
and then you would just plot the points and connect them with a straight line.
However, you can graph without transforming the equation into .
To get the coordinates of a point on the line,
you can give a value to  (or to ),
and solve for the other variable.
For  , substituting into we get
 -->  -->  -->  .
That gives us the point (0,-1), with and .
For  , we get
 -->  -->  -->  --> 
That gives us the point (3,5).
Plotting (0,-1) and (3, 5} we get 
Adding the line, we get
On the line for  , all the points have , for any and all values of .
Adding that line (in green), we get:
Answer by ankor@dixie-net.com(22740)  (Show Source):
You can put this solution on YOUR website! find y for this equation?
2x - y = 1
subtract 2x from both sides
-y = -2x + 1
y has to be positive, multiply both sides by-1
y = 2x - 1
:
"graph it along with y=-3."
find x when y = -3
2x -1 = -3
2x = -3 + 1
2x = -2
x = 2/-2
x = -1
:
Make a table to plot a graph using above coordinates and x = -3, 0 and +2
x | y
------
-3 |-7; replace x with -3, find y to be -7
-1 |-3
0 |-1
+2 |+3
:
Plot these points, your graph should look like this
Answer by Killjoy club(2) (Show Source):
Answer by ikleyn(52776)  (Show Source):
You can put this solution on YOUR website! .
How do I find y for this equation? 2x-y=1 I don't understand how to solve it and then graph it along with y=-3.
~~~~~~~~~~~~~~~~~~~~
1. Add "y" to both sides. You will get an equivalent equation
2x = 1 + y.
2. Subtract "1" from both sides you will get an equivalent equation
2x - 1 = y.
3. It is equivalent to
y = 2x - 1.
4. It is your answer.
Solved.
This procedure of three steps is called "to isolate y".
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