Question

Solve it with the Substitution method 3x+5y=-1 & y=2x-8

Answer 1

I will work this one for you but check one of my youtube videos. Forgive the musical indulgence.
http://www.youtube.com/watch?v=pNRGQV93yoA

Answer 2

Write 3x + 5y = -1 (a)
y = 2x - 8 (b)
Now substitute the value of y in (b) into (a)
Giving 3x + 5(2x- 8) = -1
Expand and simplify to find the value of x
3x +10x - 40 = -1
13x = 39
Therefore x = 3
Now substitute this value of x into (b)
y = 2(3) - 8
Therefore y = 6 - 8 = -2

Answer = x is 3 and y is -2