Question

(ii) 3x - 5y-4 = 0 and 9x = 2y + 7
find its substitution method​

Answer 1

Step-by-step explanation:

3x - 5y-4 = 0 ____(1)

9x = 2y + 7

x=2y+7/9_______(2)

from (1) and (2)

3(2y+7)/9-5y-4=0

6y+21-45y-36/9=0×9

-39y-15=0

-39y=15

y= -15/39

y= -5/13

from eq (2)

x=2(-5/13)+7/9

x=-10/13+7/9

= -90+91/117

=1/117