Question

3x-y=11
2x+5y=13

how to solve using addition?

Answer 1

Multiply every term in the first equation by 5 to get 15x-5y=55


Then add this new equation to the second equation


15x-5y=55
2x+5y=13
------------
17x+0y=68


So we get 17x = 68

Answer 2

Solve 17x = 68 for x

Then use this solution to find y

Answer 3

so do i do

17x =68 then i divide then i get x=4 then i plug in the 4?

Answer 4

Yes, x = 4

Now that you know that x = 4, you can plug it into any equation that has a 'y' in it. For instance, plug it into the second equation


2x+5y = 13


to get


2(4) + 5y = 13


Now solve for y

Answer 5

y=1?

Answer 6

You got it