Question

Solve the system 3x+2y=1 and 2x+y=5

Answer 1

x=9 & y=-13

Answer 2

solve it by what method? any you perfer?

Answer 3

any method would be great.... kindly show me how... i don't get it..

Answer 4

need a walkthrough?

you need to eliminate one of x & y from the two equations. i'd suggest you multiplied eqn 2 by 2 & subtract eqn 1 from it. this gives x=9. the rest is about substituting values int the other equation. btw your calculator can do this in less time than it takes to load this page!

Answer 5

For the conoisseur theres gauss elim, cramers rule & others. for us.. common sense :P

Answer 6

elimination (simply get rid of a variable)

3x+2y=1
2x+ y=5 <-- multiply by -2 (why?)


3x+2y = 1
-4x-2y =-10
------------ ; add together
-1x = -9 ; and solve for x

x = -9/-1 = 9

Answer 7

or u can use substitution method!!

Answer 8

sub is a good method; time consuming and labor intensive; but a good method

Answer 9

substitution comes only after he has eliminated a variable to get the value of the other,

Answer 10

substituion is the method of solving one of the equations for x or y; then "substituting" that quasi value into the other equation; its elimination of a variable but the long way

Answer 11

now since x = 9 from above we can take any equation and solve for y with it

2x+y=5

2(9)+y=5

18+y=5

y = -18+5

y = -13

Answer 12

if you have any questions, just ask :)

Answer 13

Thank you!!! I get it now!! :D