So first, we want to substitute in 15 to all the x variables.
So,
3x - 8y = 5
Becomes
3 * 15 - 8y = 5
Or,
45 - 8y = 5
So here, you can subtract 45 from both sides to move all like terms to one side.
-8y = 5 - 45
And then simplify:
-8y = -40
Then divide both sides by -8
y = 5
Solve for N by simplifying both sides of the equation, then isolating the variable.
N=700
Hope this helps, if not, comment below please!!!
The answer is x = -2. The steps are in the image below.
Hope this helps!!!!!!!!
Please give me brainliest!!!!!!!!!!!