× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
14
o
6
6
G
3
c
3
q
3
m
3
j
3
s
2
b
2
j
2
u
2
Home Q & A Board Science-Related Homework Help Mathematics
New Topic  
ilikebigbutts ilikebigbutts
wrote...
Posts: 79
Rep: 0 0
11 years ago
I have several of these equations to solve and I don't even know where to begin. Can someone break it down for me on how to work this equation? I'll be able to figure out the others once I see how it's done.

3x - y = -2
5x = y

Any help is greatly appreciated. Thank You.
Read 174 times
7 Replies

Related Topics

Replies
wrote...
#1
11 years ago
3x - y = -2
5x = y

in the first equation, replace y with 5x:
3x - (5x) = -2
-2x = -2
x = 1
y = 5x = 5
wrote...
#2
11 years ago
3x + -1y = -2
5x = 1y

Think algebraically so change all subtraction to addition and think of a lone variable with a 1 in front of it.
wrote...
#3
11 years ago
Do you mean system of equations?
Assuming that:
Since y=5x according to the second equation, you can substitute 5x for y in the first equation.
3x - 5x = -2
-2x = -2
x = 1
Plug in 1 for x in 5x=y to find y. The equation can be turned around to
y = 5x
y = 5(1) = 5

answer: (1, 5)
wrote...
#4
11 years ago
Step 1... split up x and y
3x = y - 2
5x = y

Step 2... depending on the equation, you either want to add or subtract the equations..

Subtract...

-2x = 0y - 2

Step 3... solve

x = 1

5x = y.... x=1
5(1) = y
y = 5
wrote...
#5
11 years ago
From the bottom equation we can see that y is 5x. This can be 'substituted' in to the top equation.

We take the 5x and place it in the top equation instead of y (as 5x = y)
This gives:
3x - 5x = -2

which can be written as:
-2x = -2

if we divide both sides of this equation by -2 we get:
x = 1

Then we can use this in the bottom equation to give:
5*(1) = y

so y = 5

hope this helps
wrote...
#6
11 years ago
Okay, for starters let the first equation as #1 and the second as #2.

Since #2 has y=5x, we can use that to substitute for #1. So #1 will be 3x-5x= -2.

Combine the like terms and it will be -2x= -2. Simplify and x=1.

For #2, substitute x=1 to #2 so it will be 5(1)=y. Simplify and y=5.

The answers are x=1 and y=5.

Hope this helps!! ~Jyna
wrote...
#7
11 years ago
3x-y=-2
5x=y

3x-y=-2
-3x    -3x
--------------
-y=-3x-2
y=3x+2(now plug this into the other equation)

5x=y
5x=3x+2
-3x -3x
---------------
2x=2
/2  /2
x=1(now plug this into the other equation)

y=3x+2
y=3(1)+2
y=3+2
y=5


So x=1, and y=5. The proper way to write this is- (1,5)
Get it?
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1144 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 189
  
 402
  
 268
Your Opinion
Previous poll results: Does a gender wage gap exist in America?