exam Maths Puzzle Numerical Ability

30 + 6[-4 -5(6 -4)^2]

Read Solution (Total 0)

exam Other Question

i just need to know the right answer to see if im doing it right.. test tomorrow Solve the system by addition or substitution.
-15x + 3y = 9
y = 3 + 5x

Please help me with this problem step by step if at all possible then maybe I can actually catch on, on how to do these problems. THANK YOU!!