Solve for b by elimination 2a+3b=12

5a-b=13

Answer: 2a+3b=12

b = (12-2a) / 3

5a-b=13

b = - 13+5a

Step-by-step explanation:

1) 2a+3b=12

-2a - 2a

3b=12-2a

/3 / 3

b = (12-2a) / 3

2) 5a-b=13

-5a - 5a

-b=13-5a

*-1 * -1 - b = 13 (-1) - 5a (-1) * you'd multiply by - 1 to cancel out the negative on b*

b = - 13+5a