Solve the system of linear equations below.

y = -2x + 19
y = x + 7
x = 4, y = 11
x = -12, y = -5
x = -4, y = 3
x = 8, y = 3

What would be the reasons for lines 3 and 4? a. addition property; subtraction property b. addition property; solve c. substitution property; subtraction property d. substitution property; prove