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

this equation can be solved because from the first equation you have a=3b-4 so if we substitute that in the second equation for a, we can then solve for b. doing so gives us this:

3b-4+b=16
4b-4=16
4b=20
b=5

now that we know b, we can plug that back into either original equation and solve for a:

a=3(5)-4
a=15-4
a=11

so your ordered pair will look like this:

(5,11)