Question 1180156
I am thinking of two numbers.
 a & b 
Twice the first number added to four times the second number is 22.
 2a + 4b = 22
simplify, divide by2
 a + 2b = 11
The first number is one less than twice the second number.
 a = 2b - 1
write as
 a - 2b = -1
Find the two numbers.
using elimination
 a + 2b = 11
 a - 2b = -1
-------------------addition eliminates b, find a
 2a = 10
 a = 10/2
 a = 5
find b using the simplified equation
 5 + 2b = 11
 2b = 11 - 5
 2b = 6
 b = 6/2
 b = 3
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Check in the 2nd original equation
5 - 2(3) = -1