What equation is solved by the graphed systems of equations?

two linear equations that intersect at the point 7, 25.

3x + 4 = 5x - 10
3x - 4 = 5x - 10
3x + 4 = 5x + 10
3x - 4 = 5x + 10

How much money does ron have left each month after his fixed expenses? ron graduated from college five years ago. he recently bought a house, but shares it with a housemate who pays him $800 a month for rent and utilities. ron is putting a budget worksheet together so he will have a better idea of where his money is going and where he can save. enlarge