anonymous
  • anonymous
What is the graph of the equation? -5x+y=-3 I don't know what to do, help?
Mathematics
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anonymous
  • anonymous
What is the graph of the equation? -5x+y=-3 I don't know what to do, help?
Mathematics
schrodinger
  • schrodinger
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Owlcoffee
  • Owlcoffee
You can give any arbitrary number to "x" and solve for "y", for at least two points on the graph, if you join the points you'll obtain the graph of that line.
anonymous
  • anonymous
I'm sorry could you explain just a bit more? if thats possible
anonymous
  • anonymous
I can use -5 for x right? But how would i go about solving y.. Thank you btw I'm sorry im so confused haha

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Owlcoffee
  • Owlcoffee
Say for instance, We consider x=-5, then: \[-5(-5)+y=-3\] Now, we just operate: \[25+y=-3\] \[y=-28\] So, therefore, the point "w", as we can call it, belongs in the line whose equation is given, if you represent this point on the cartesian plane, and repeat the process for another value of "x", then join the points, you'll obtain the graph of the line. \[w(-5,-28)\]
skullpatrol
  • skullpatrol
-5x + y = -3
triciaal
  • triciaal
another more direct approach let y be the subject
skullpatrol
  • skullpatrol
Have you learned the form y = mx + b
anonymous
  • anonymous
Yes.
skullpatrol
  • skullpatrol
y = 5x -3
triciaal
  • triciaal
when x = 0 y = -3
skullpatrol
  • skullpatrol
I added 5x to both sides :-)
anonymous
  • anonymous
Would it be positive or negative?
skullpatrol
  • skullpatrol
Does that make sense?
anonymous
  • anonymous
Yes it does, I have 2 answer choices that could work i just need to figure out if its negative or positive
skullpatrol
  • skullpatrol
5x + (-5x) = 0
imqwerty
  • imqwerty
ok i'll tell a simpler way
anonymous
  • anonymous
please
skullpatrol
  • skullpatrol
What do you want to know is positive or negative?
anonymous
  • anonymous
The line on the graph
skullpatrol
  • skullpatrol
The slope is positive because the 5 in 5x is positive.
imqwerty
  • imqwerty
if u have something like this- ax+by=c then just divide all over by c \[\frac{ ax }{ c }+\frac{ by }{ c }=\frac{ c }{ c }\]\[\frac{ x }{ \frac{ c}{ a }}+ \frac{ y }{ \frac{ c }{ b } }=1\] calculate c/a and c/b and (c/a, 0)=point where the graph cuts x axis (0,c/b)=point where graph cuts y axis so basically just identify a,b,c and then find the points then join them and thats ur graph
skullpatrol
  • skullpatrol
Do you understand what slope is?
imqwerty
  • imqwerty
@mickey1513 did u get my method?
anonymous
  • anonymous
So, its going to be positive
anonymous
  • anonymous
yay it was right. thank you i get it now all of you deserve medals
imqwerty
  • imqwerty
well thr best way was like what owl said u jst take some random value of x and get y and plot that point then u take another random value of x and put it in equation nd get y and pot this point and then join these 2 points
skullpatrol
  • skullpatrol
Thanks for asking :-)

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