contestada

Jade solved the following equation:

3 + 5x – 7 = 3x – 9

Step

Work

Justification
1

5x + 3 – 7 = 3x – 9

Commutative property of addition
2

5x – 4 = 3x – 9

Addition property of equality
3

2x – 4 = –9

Subtraction property of equality
4

2x = –5

Addition property of equality
5

x = –2.5

Division property of equality


Which step has an incorrect justification?

Respuesta :

Answer:

its step 4

Step-by-step explanation:

Answer:

Step 2

Step-by-step explanation:

From the original equation to step 1, 5x and 3 have been switched.  This is the commutative property of addition.

From step 1 to step 2, 3 and -7 have been combined to make -4.  This is not the addition property of equality; this is addition or simplification.