clc
clear
disp("kaliyah johnson")

A = [3 2 -4 5; 5 -6 7 -2; 8 9 3 4; 12 -5 6 7];
B = [20; -15; 73; 48];

C = A\B;

x = C(1)
y = C(2)
z = C(3)
w = C(4)