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5x + 0 = 15
x = 3
plug to the first equation
2.3 + y = 6
y = 0

so i would just add the numbers then divide

give me another problem, i'll explain in more details because this is problem is very simple.

ok 4a-5b=7
4a+5b=17

alright. this is also simple. Let's change to 4a + 5b = 7
2a + 3b = 9 instead.

now what do you do? I want to know how you do it, then I'll explain

i add 4a to 2a right

continue

then i add5b and3b

ok. but the new equation doesn't get rid of any variables right? so your stuck

you have to modify the original equations somehow so when adding you will get either 0x or 0y

did you learn how to modify the equations yet? or just purely adding stuff?

no did learn to modify the equations

okay then please try to modify this one:
4a + 5b = 7
2a + 3b = 9

i cnt i dnt understand how to modify im sorry

let's try to modify so when adding I will get 0a ok?

ummm yes

you can do this by multiply 2nd equation by -2

what's the modified equation now?

ok the modified (2nd equation) becomes:
-4a -6b = -18

now you can add the first and the modified.

so then id add the 4a and 5b

no no. it's gonna be like this:
4a + 5b = 7
+
-4a -6b = -18
-----------------------
0a -b = -11

you only add the a and a... b and b not a and b.

you have to modify both equations for b.

4a+2a right

yes what about b

5b+3b?

so you will get 6a + 8b = 16?

it doesn't get rid of b does it?

so i subtract

you are not clear about the concept of adding.

one thing I can tell you that when adding you must get rid of one of the variables.

no im not im sorry thnks for tryin to help tho

i have to go home. sorry