Question

What is the first step to solving this system of equations using the substitution method?
x + y = 11
x = -y - 9
add the equations together
substitute -y-9 in for x in the top equation
substitute y=11 in for x in the bottom equation
No answer text provided

Answer 1

The first step to solving this system of equations using the substitution method would be to substitute the expression for x from the second equation into the first equation. This would result in a new equation with only one variable, which can then be solved.