Question 50713
x + 4y = 7
1/2x + 2y = 5


you cannot solve this system of equations because 

x+4y = 7
x+4y = 10

they are parallel lines which have 3 distance between. parallel lines do not have intercepts so there isn't an answer

slope equals to {{{rise/run}}} which mean the change in y divided by the change in x (delta y / delta x). You better look at the lessons. 

if you want to find y intercept give "0" value to x in the equation and x will be out of the way ;)