SOLUTION: y=x-7
2y-x=-10
what is the solution to the above system of equations ?
thank you.
Algebra.Com
Question 198241: y=x-7
2y-x=-10
what is the solution to the above system of equations ?
thank you.
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Start with the second equation.
Plug in into the first equation. In other words, replace each with . Notice we've eliminated the variables. So we now have a simple equation with one unknown.
Distribute
Combine like terms on the left side
Add 14 to both sides
Combine like terms on the right side
Now that we know that , we can plug this into to find
Start with the first equation.
Plug in
Subtract
So our answer is and which also looks like )
Notice if we graph the two equations, we can see that their intersection is at . So this verifies our answer.
Graph of (red) and (green)
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