Question 121553
this is a problem involving solving a system of equations.  The system is as follows:<br>

y = x + 10
x+y = 8<br>

now we just plug in the first equation into the second one and solve for x.<br>

x + x + 10 = 8 --> combine like terms
2x + 10 = 8 --> Subtract 10 from both sides
2x = -2 --> divide both sides by 2
x = -1<br> 

now that we have a value for x plug that into the first equation and solve for y.<br>

y = -1 + 10
y = 9