Answer:
1. Yes
2. Yes
Step-by-step explanation:
1. Lets test Lisa's different solution. Lets times 5 to the first equation:

and 2 times the second equation:

lets add the two equations:


The second method is multiplying the first equation by -2:

and add the second equation:

![y=1[tex]Substitute into equation 1:[tex]x+2\cdot{1}=7](https://tex.z-dn.net/?f=y%3D1%5Btex%5D%3C%2Fp%3E%3Cp%3ESubstitute%20into%20equation%201%3A%3C%2Fp%3E%3Cp%3E%5Btex%5Dx%2B2%5Ccdot%7B1%7D%3D7)

The answer to Lisa's question is yes she wull get the same solution if she uses a different method.
2. Yes, The answer would change if the same amout of x and y values are the same and therefore we cannot solve for x and y. If there was infinitely many solutions we would have quadratic equations.