Convert the following equation
into slope intercept form.
4x + y = 9

y=-4x+9

Step-by-step explanation:

Try to convert the equation into y=mx+b form (slope intercept form) by doing the following

4x+y=9                  Original equation

4x-4x+y=-4x+9      Subtract 4x from both sides to isolate y variable

y=-4x+9                 Simplify

because linear equations are a lot simpler than quadratics equations, and linear equations formula is a lot easier to memorize. that's why i think they're harder.

a. is correct