Question

2x+3y=7; (a-1)x-1(a+2)y=3a

Answer 1

Answer:

=7

Step-by-step explanation:

solutions is :

a1/a2=b1/b2=c1/c2

=>  2/a-1=3/a+1=7/3a-1

=> 2/a-1=3/a+1

(cross multiplication),

=>  2(a+1) = 3(a-1)

=>  2a+2 = 3a-3

=>  2a-3a+2+3 = 0

=>  -a+5=0

=>  -a=-5