3x-4y=10 4x+5=23 ?
We can solve the second equation first because it has only one unknown variable.
So, let’s subtract 5 from both sides of the equation (this is legal because it keeps both sides equal to one another)
Now we divide both sides by 4…
x = 4.5
Now that we know x, we can plug its value into the first equation
3(4.5) -4y = 10
13.5 - 4y = 10
Subtracting 13.5 from both sides
-4y = -3.5
DIviding both sides by -4
y = 0.875 or 7/8