Question

3x + y = 23
1/3 x - 1/4 y = 4
solve for x and y

Answer 1

to eliminate the fraction, lets multiply 2nd equation by 12
what do u get?

Answer 2

4 x - 3y = 16

Answer 3

12*4=?

Answer 4

48

Answer 5

so it will be 4 x - 3y = 48 , isn't it ?

Answer 6

oooh I see

Answer 7

now to make the co-efficients of y equal in magnitude, multiply 1st equation by 3
and tell me what u get?

Answer 8

9x + 3y = 69

Answer 9

yes, now u have two equations :
9x + 3y = 69
4 x - 3y = 48
ADD them, and tell me what u get.

Answer 10

13 x = 117
117/ 13
x= 9
I got it ! thanks a ton (:

Answer 11

also find y
welcome :)