× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
g
3
3
2
J
2
p
2
m
2
h
2
s
2
r
2
d
2
l
2
a
2
Home Q & A Board Science-Related Homework Help Mathematics
New Topic  
firebucks74 firebucks74
wrote...
Posts: 83
Rep: 0 0
11 years ago
I need help solving this question. It is solving systems of equations by substitution
4x+5y=11
y=3x-13
Read 612 times
4 Replies

Related Topics

Replies
wrote...
#1
11 years ago
sub y=3x-13 into 4x+5y=11

i.e 4x+5(3x-13) =11
4x+15x-65=11
19x=76
x=4

y=3x4-13 = -1
wrote...
#2
11 years ago
4x+5y=11 and you know y=3x-13 so you replace y in the original equation with the second known equation and solve
4x+5(3x-13)=11
4x+15x-65=11
19x-65=11
19x=76
x=4

Hope this helps
wrote...
#3
11 years ago
X = 4
Y = -1
wrote...
#4
11 years ago
4x+5y=11
y=3x-13

substituting equation 2 to equation 1

4x+5(3x-13)=11
4x+15x-65=11
19x-65=11
  19x=11+65
  19x=76
    x=4 answer

plugging x=4 to equation 2

 y=3(4)-13
 y=12-13
 y=-1 answer
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1128 People Browsing
 116 Signed Up Today
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 1045
  
 234
  
 376