Question

solve by substitution
9x+8y=18
-2x+y=21
please help URGENT

Answer 1

@LaloHao

Answer 2

We want to get the solution from both equations, so
Take any of the two equations and solve for any variable, let's do it for "y" from the second equation since it looks easier
\[y=21+2x\]
Then substitute that for any "y" in the other equation
\[9x+8(21+2x)=18\]
All that's left is to solve for x and you got your answer

Answer 3

I got x=6 I have another problem if you would like to help

Answer 4

yea

Answer 5

25x^7+25x/5x

Answer 6

that's all the info?

Answer 7

yes

Answer 8

If you just have to simplify
\[25x⁷+5\]