2. What is the first step to solve the following system of equations using substitution? 2- y = 12
2x - y = 12
Add the two equations together.
Solve the first equation for x.
Multiply the first equation by 2.
Divide the second equation by 2.

An equation where variables are used to represent known values—function notation true or false

If f(x) = 4x – 3 and g(x) = 8x + 2, find each function value a. f[g(3)] b. g[f(5)] c. g{f[g(-4)]}

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions. a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0