Question

use the elimination method to solve the system of equations.
a+7b=16
a+3b=4 possible answers. there is one solution, it is _. b. there are infinitely many solutions. C. there is no solution

Answer 1

First set:
a=16-7b
"Just move over 7b on the upper"
Then use a in the second and insert "a" into the second equation and solve b When you know b, you can insert b in the first and figure out a ;)
I hope you understand, please write back if you don't :)

Answer 2

so the answer is a=16-7b?

Answer 3

Correct at first, now set a, into the other equation like this:
(16-7b)+3b=4
And solv b :)

Answer 4

so would the correct answer be 12+21b?