SOLUTION: Solving this linear equation with substitution. The linear equation is: 4x-5y=20 and 5x+5y=70. I need this solved by substitution and I must show all the work. Thanks

Question 314937: Solving this linear equation with substitution.
The linear equation is:
4x-5y=20 and 5x+5y=70.
I need this solved by substitution and I must show all the work.
Thanks
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
1.
2.
From eq. 2,

Substitute this expression into eq. 1,

Then,

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