Based on the system of equations above, what is the value of 10a ?
A. -10
B. -1
C. 3
D. 30
Answer:D
Based on the system of equations above, what is the value of 10a ?
A. -10 B. -1 C. 3 D. 30
Explanation: D Whenever there are two equations with the same two variables, they can be solved simultaneously by adding or subtracting them. The key is to get one variable to disappear. Multiply the second equation by -2, to get 6a - 2z = 20. Stack the two equations and add them.