Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
ajb44612
Group Title
how do you use the substitution method for 5x+3y=7 and y=x3
 one year ago
 one year ago
ajb44612 Group Title
how do you use the substitution method for 5x+3y=7 and y=x3
 one year ago
 one year ago

This Question is Closed

CalebBeavers Group TitleBest ResponseYou've already chosen the best response.0
You know y=x+3 so put x3 in for y in the other equations and solve for x 5x+3(x3)=7 then use x to solve for y
 one year ago

CalebBeavers Group TitleBest ResponseYou've already chosen the best response.0
x3*****
 one year ago

ajb44612 Group TitleBest ResponseYou've already chosen the best response.0
ok, so after you write 5x+3(x3)=7 then what do you do from there?
 one year ago

lilg132 Group TitleBest ResponseYou've already chosen the best response.1
you replace y with the equation given so 5x + 3y =7 y = x  3 so it will now be 5x + 3(x  3) = 7 expand it 5x + 3x  9 = 7 bring the numbers to one side and letters on the other 5x + 3x = 7 + 9 8x = 16 now divide 8x by 8 to get x on its own but you have to do it to both sides 8x / 8 = 16 / 8 x = 2
 one year ago

lilg132 Group TitleBest ResponseYou've already chosen the best response.1
now we know what the value of x is we can work out y 5x + 3y =7 so 5(2) + 3y = 7 expand the bracket 10 + 3y = 7 now move numbers to one side and letters to the other 3y = 7  10 3y = 3 divide both sides by 3 to get y on its own 3y / 3 = 3 / 3 y = 1 DONT FORGET TO CLICK BEST RESPONSE =)
 one year ago

ajb44612 Group TitleBest ResponseYou've already chosen the best response.0
ok thanks so much! ok so i have a couple more i might need help with....so how bout 3x+2y=11 and x+y=4?
 one year ago

ajb44612 Group TitleBest ResponseYou've already chosen the best response.0
can someone please help!
 one year ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.