Question

3x=2y+10
9y=3x-7

Answer 1

Have you learned "substitution"?

Answer 2

\(\color{red}{3x}=2y+10\)
\(9y=\color{red}{3x}-7\)

Put the right hand side of the first equation into the red (3x) of the second equation and solve for y, and then x.

Answer 3

I did it
9y=(2y=10)-7
9y=2y+10-7
9y-2y=10-7
7y=3
y=3/7

Answer 4

i need to solve it by addition method

Answer 5

y=3/7 and x=76/21

Answer 6

You can do that too, by adding the two equations together, and cancelling 3x on each side. The rest is the same.
BTW, what did you get for X?

Answer 7

and i got struck

Answer 8

Yes, the answer is correct.

Answer 9

Where did you get stuck?

Answer 10

but i can't solve for x

Answer 11

i know answer but i don't know how to do it

Answer 12

Add the two equations together:
3x=2y+10
9y=3x−7

You'll get
9y+3x = 2y+3x+10-7
So by cancelling 3x and isolating y, you get
9y-2y=3
7y=3
y=3/7

The rest is the same.

Answer 13

i don't know how to solve for y because i am really bad at math

Answer 14

Do you mean you don't know how to solve for x?

Answer 15

yes

Answer 16

really i don't know

Answer 17

Put y=3/7 into one of the two equations, say the first one.
3x=2y+10
3x=2(3/7)+10
3x=6/7+10
3x=76/7
x=76/(7*3)=76/21

Please study and make sure you understand all the steps!