Question 682842
y = 2x+7


so y and 2x+7 are the same thing


this means you can replace all/any y values in the second equation with 2x+7


to go from 


2x-y=-15


to 


2x-(2x+7)=-15


Then distribute to get


2x - 2x - 7 = -15


and combine like terms to get


0x - 7 = -15


Then simplify to get


-7 = -15


This is NEVER true regardless of what the value of x or y is. 


So there are NO solutions to this system because the system is <u>inconsistent</u>