+0  
 
+1
36
2
avatar+176 

solve:

5x - y =5

2y - x^2 = 11

 

(non-calculator question) 

jakeharris02  Apr 29, 2018
Sort: 

2+0 Answers

 #1
avatar+607 
+2

Adding y and subtracting 5 to both sides on the top equation, we have:

 

y = 5x - 5 

 

Substituting y = 5x - 5 into the bottom equation, we have:

 

10x - 10 - x^2 = 11

 

x^2 -10x + 21 = 0.

 

Factoring:

 

( x - 3 ) ( x - 7 ) = 0

 

x = 3, x = 7

 

Solving for y, we have: y = 30, y = 10.

 

You can also graph the functions on desmos.com and then find the intersection points. 

 

I hope this helped, 

 

Gavin.

GYanggg  Apr 29, 2018
 #2
avatar+2584 
+1

Perfect, Gavin! smileysmiley

tertre  Apr 29, 2018

8 Online Users

avatar
New Privacy Policy (May 2018)
We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  Privacy Policy