Question

9x-7y=-3
-3x+5y=9
eliminate the x-terms

Answer 1

x= 3.25 and y=3.75

Explanation:

9x-7y= 3 (1)

-3x+5y= 9 (2)

(2)×3:

-9x+15y= 27 (3)

(1)+(3):

(9x-7y)+(-9x+15y)= 3+27

8y= 30

y= 30/8

= 3.75 (4)

sub (4) into (2):

-3x+5(3.75)= 9

-3x+18.75= 9

-3x= -9.75

x= 3.25