5.4 Solving Systems by Addition Question: 5

Question

Writing  Solve the system using addition. Use pencil and paper. Explain why the addition method is a good choice for solving the system. If you wanted to solve for x​ first, is the addition method still a good​ choice? Explain.

x-3.1y=-2.2

-x+5.2y=6.4

The solution is ______________

enter your response here.

​(Type an ordered​ pair.)

Answer 1

add the 2 equations to eliminate one variable, leaving

2.1y = 4.2

y = 4.2/2.1 = 2

y = 2

x = 3.1y -2.2 = 3.1(2) -2.2 = 6.2 -2.2 = 4

(x,y) = (4,2)