Question

3x-5y=4
2y+7=9x
By substitution method

Answer 1

Answer:

3x - 5y = 4

2y +7 = 9x

by equation 1 we get,

x = 4+5y/3

putting this value of x in equation 2, we get,

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

2y+7 = 3(4+5y)

2y +7 = 12+15y

15y-2y = 7-12

13y = - 5

y = -5/13

now we know,

x = 4+5y/3

= 4+ 5(-5/13) /3)

x = 131/39