I tried many times to solve the following 2 problems but cannot get the answer. It looks simple enough yet so tough.
Solve each system of equation by substitution.
2c - d + 2 = 0
3c + 2d + 10 = 0
a + 4b = 3
5b = -2a + 3
No matter how I substitute, my answers could not match the answer key. The answer key for problem 1 is (-2,-2) and problem 2 is (-1,1). Please help. Thanks.