When solving an equation with two variables, replace the variables with the values given and then solve the now variable-free equation. (Remember order of operations, PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.)
Solve -2b - 9b = 6b + 3z - 7 for b in terms of z.
| z - 4\(\frac{1}{2}\) | |
| -1\(\frac{1}{2}\)z + \(\frac{7}{8}\) | |
| \(\frac{7}{12}\)z + \(\frac{2}{3}\) | |
| 1\(\frac{1}{9}\)z + \(\frac{5}{9}\) |