Question 22405
Solving by elimination means you need to eliminate one of the variables to solve for the other.
So lets start by eliminating the x;
-3x+8y=10
5x+6y=80
To eliminate the x we need to make both numbers opposite so they cancel out, so we will need to multiply each equation by the number that does that.
(5)-3x+8y=10
-15x+40y=50 - eq.1
(3)5x+6y=80
15x+18y=240 - eq.2
Now we will add one equation to the other;
-15x+40y=50
 15x+18y=240
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    58y=290
   y=5
Now that we have y, we will plug that into the equation to solve for x;
5x+6(5)=80
5x+30=80
5x=50
x=10
Hope you understand
=)