Question 394043
Im guessing its telling you to solve using substitution ?
Well your lucky, most of the work is already done :D
you know y=x-7 , so just replace y with (x - 7) in the other equation
4x - 7(x-7) = 10
4x - 7x + 49 = 10
-3x = -39
x = 13

Now just plug X in the original equation to fine Y 

y = x - 7
y = 13 - 7
y = 6

so the solution would be 

(13,6)