Solve the equation by using the Properties of Equality.
9x – 3 = 42

Step-by-step explanation:

9x-3=42

9x=42+3

9x=45

9x/9=45/9

x=5

For the number 7, begin by solving for k.
Remember your discriminant rules:
k is greater than 0, there are 2 real solutions
k is equal to 0, there is one real solution
k is less than 0, there are no real solutions

On number 8, solve for a, and then figure out the number of solutions using the rules above.

Hope this helps!