5.4 Solving Systems by Subtraction and substitution Question: 4

Question

5.4 Solving Systems by Subtraction and substitution Question: 4

Solve the system of equations using subtraction.

2x-2y=-4

2x+4=8

____________

​ (Type an ordered​ pair.)

Answer 1

2x - 2y = -4

2x +4y = 8 subtract 1st from 2nd equation, to eliminate one variable,

6y = 12

y = 12/6 = 2

2x = -4+4 =0

x = 0

(0,2) is the solution

Unless you really intended to write it as

2x -2y = -4

2x +4 = 8

then the 2nd equation reduces to

2x = 4

x = 2

2y = 2)(2)+4 = 8

y = 8/2 = 4

(2, 4) is the solution. But odds are you left a "y" out of the 2nd equation, so go with (0,2)