Alfrednovember365viz
Answered

Solve the following systems by substitution method:
5b – 2 = 2a
3a + 6 = 25b

Sagot :

Mlcparra16viz
We simplify the first equation:
5b - 2 = 2a
5b/2 - 1 = a

So in the second equation:
3a + 6 = 25b
3 (5b/2 - 1) + 6 = 25b
15b/2 - 3 + 6 = 25b
3 = 25b - 15b/2
3 = 35b/2
6 = 35b
6/35 = b

So:
5(6/35)/2 -1 = a
6/14 - 1 = a
-4/7 = a