Question

Usando el metodo de sustitucion: (15x+11y=32 ... 7y-9x=8)

Answer 1

15x + 11y=32
7y-9x=8

7y-9x=8
7y=8+9x
Y=8/7 + 9/7x

15x + 11(8/7+9/7x) =32
15x +88/7+99/7x =32
105/7x + 88/7 + 99/7x
204/7x + 88/7= 32
204/7x=32- 88/7
204/7x=224/7 - 88/7
204/7x= 136/7
X= 136/7 × 7/204
X=136/204
X=2/3

7y- 9×2/3=8
7y-18/3=8
7y-6=8
7y=8+6
Y= 14/7
Y= 2
Rta: y=2 ; x=2/3