Appalachian mountains are located in which of the following native american cultural regions? plains northeast northwest great basin

Hey free points ! people i have a few math questions on my profile consider looking at them i have to get done in 30 mins!

50 will mark show all use the linear combination method to solve the system of equations. explain each step of your solution. if steps are not explained, you will not receive credit for that step. 2x+9y= -26 -3x-7y=13

Change negative exponents to positive, then solve