In a rectangular coordinate system, the line $5y = 2x$ intersects the line $3x - 4y = 7$ at point $Z$. What is the sum of the coordinates of point $Z$?
I need to find the coordinates of point $Z$, which is the intersection of two lines. To do that, I can use either substitution or elimination to solve the system of equations. I notice that the first equation can be easily solved for $y$, so I'll use substitution. Dividing both sides by $5$, I get $y = \frac{2}{5}x$. Now I can plug this into the second equation and get $3x - 4(\frac{2}{5}x) = 7$. Simplifying, I get $3x - \frac{8}{5}x = 7$, or $\frac{7}{5}x = 7$. Dividing both sides by $\frac{7}{5}$, I get $x = 5$. This means that $y = \frac{2}{5}(5) = 2$. So the coordinates of point $Z$ are $(5,2)$. The sum of the coordinates is $5 + 2 = 7$. 