Question

elimination method
a+7b=13
a+2b=-2

Answer 1

7b-2b = 13-(-2)
5b = 15
b = 3

Answer 2

a + 7(3) = 13
a + 21 = 13
a = 13-21
a=-8

Answer 3

So the one solution is? 3,-8?

Answer 4

\[a+7b=13[1]\]
\[a+2b=-2[2]\]
\[[1]-[2]\]
\[(a+7b)-(a+2b)=(13)-(-2)\]
\[a+7b-a-2b=13--2\]
\[5b=13+2\]
\[5b=15\]
\[b=3\]
Find a by subbing b as 3 into one of the equations given to you above.

Answer 5

Make sure you don't just seek for the answers. Actually look at how people solve the questions. Look at their methods and their approach to the question. You will better understand how to solve these if there comes a time for an exam.

Answer 6

Definitely. I am trying to better understand the entire concept

Answer 7

since the point is finding a and b then the answer is an ordered pair starting with a correct?

Answer 8

Could you rephrase that last part please? ordered pair starting with a?

Answer 9

a is 3 so it is 3,-8

Answer 10

thanks

Answer 11

no it's not 3.

Answer 12

You mixed it up.

Answer 13

I meant te othe way around sorry, -8,3)

Answer 14

3=b