this is the question
John bought 3 shirts and 4 pairs of socks for $78.
Joan bought 2 shirts and 6 pairs of socks for $72.
Letting $x equal the price of a shirt and $y equal the price of a pair of socks, write a linear equation to represent each transaction.
Draw on the same axes the graphs of the two equations. Read off the co-ordinates of the point of intersection to find the values of x and y.
i came up with this
3x + 4y = 78
2x+ 6y = 72
howeve, im not sure how do the graphany help on this ould be cool