1. plug in the values
3(2) - (-1) = 7; true
2(2) + 3(-1) = 1
4 -3 = 1; true
yes, the point is true for the system. .
2.
the solution is referring to where both the lines intercept on the graph.
3. replace 'y' in the first equation with the second equation
3x + 6x + 1 = 10
9x + 1 = 10
9x = 9
x = 1
plug x = 1
y = 6(1) + 1
y = 7
(1,7)
4. elimiate the common terms which is 'n' which gives;
5m = -5
m = -1
plug in to find 'y' AKA 'n'
3(-1) - n = 2
-3 - n = 2
-n = 5
n = -5
I can futher explain if you'd like, let me know.