Question

Solve this system of equations using substitution. Put your answer in ordered pair form, (x, y).
a = 3b - 4
a + b =16

Answer 1

u should try this

Answer 2

substract 2 of 1
(2) -(1)
a + b -a =16 -3b+4
b+3b=20
b=20/4
b=5

solve (2) or (1) with b
a+5=16
a=11

Answer 3

3b-4+b=16
4b=20
b=5
a+b=16
a+5=16
a=11
(11,5)