Answer:
Substitution
Substitution
Elimination
Elimination
Substitution
Elimination
Explanations are given below
Step-by-step explanation:
Hello!
1) Substitution
This is because you already have a solution for a variable, y, and you can simply plug in the value of y for the second equation
2) Substitution
The same thing as above, you already have the value of y, and you can simply plug it into the second equation.
3) Elimination
You should use elimination because you can simply eliminate the variable y by adding the two equations, as they have the same coefficient of 3.
4) Elimination
Same as above, simply add the two equations to eliminate x, because they have the same coefficients of 7.
5) Substitution
You have the value for y, so simply plug it into the other equation to solve for x.
6) Elimination
You have -2x in both equations, and subtracting the equations will eliminate the variable x, and you can then solve for y.
