How do you solve by substitution #a = 3b - 4# and #a + b =16#?
2 Answers
Apr 2, 2018
Explanation:
From (2),
Sub (3) into (1)
Apr 2, 2018
Explanation:
We know a in terms of b with the help of equation 1
So put that that in equation 2,
Add 4 on both sides
Divide both sides by 4
Substitute that in one of the original equations
Subtract 5 from both sides
So