To solve the system of equations:
Equation 1: y = 5x + 7
Equation 2: 3y - 15x = 18
First, we can substitute Equation 1 into Equation 2 to get rid of the variable y.
3(5x + 7) - 15x = 18
15x + 21 - 15x = 18
21 = 18
This equation is not true, which means there is no solution to the system of equations.