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 a - 4a = 7a - 8z + 9 for a in terms of z.
| -z + \(\frac{1}{2}\) | |
| \(\frac{2}{3}\)z - 1\(\frac{1}{2}\) | |
| \(\frac{11}{13}\)z + \(\frac{5}{13}\) | |
| \(\frac{10}{11}\)z + \(\frac{3}{11}\) |