Question

using elimination method to solve this:

a + 8b = 18
a + 4b = 6

Answer 1

if you let

a + 8b = 18 be equation 1
a + 4b = 6 be equation 2

then equation 1 - equation 2 will eliminate a

and leave

4b = 12

solve for b.

then substitute your value of b into equation 1 and solve for a