Answer:
c = 16, a= 27
Step-by-step explanation:
-3(4a + 3c) = -3(156) Find a GCF
4(3a + 4c) = 4(145) Make one negative to cancel out one variable
-12a - 9c = -468 Solve for C
12a + 16c = 580
7c = 112
c = 16
3a + 4c= 145 Substitute C into one of the original equations
3a + 4(16) = 145 Solve for A
3a + 64 = 145
3a = 81
a = 27