Question

HELP I DONT GET IT!!!For the system below solve using linear combinations method 2a+3b=1 and -2a+b=11

Answer 1

Because it using subtraction on one and multiply on the other

Answer 2

Linear combination method just means to add the equations so that one variable with cancel. In this case the a values are already set up so that they will cancel.
2a + 3b = 1
-2a + b = 11
4b = 12
b = 3

now put 3 back into either of the original equations and solve for a.
2a + 3(3) = 1
2a + 9 = 1
2a = -8
a = -4
(-4,3)