SOLUTION: solve by substitution method what is the solution of the system? 4x+3y=-11 and -8x+y=43

Question 215115: solve by substitution method what is the solution of the system? 4x+3y=-11 and -8x+y=43
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

Start with the given system of equations:

Start with the second equation.

Add to both sides.

Rearrange the terms and simplify.

-------------------------------------------

Move back to the first equation.

Plug in .

Distribute.

Combine like terms on the left side.

Subtract from both sides.

Combine like terms on the right side.

Divide both sides by to isolate .

Reduce.

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Since we know that , we can use this to find .

Move onto the second equation.

Plug in .

Multiply.

Subtract from both sides.

Combine like terms on the right side.

So the solutions are and .

This means that the system is consistent and independent.

Notice when we graph the equations, we see that they intersect at

. So this visually verifies our answer.

Graph of (red) and (green)

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