Equations Lesson 5
4(a + 2) = 2(a + 5)
-2a           -2a
4a + 8 =
2a + 8 = 10
2a = 2
a = 1
=
+
What is the first step in the above equation?
3(b + 5) = 6(b - 1)
 3b + 15 = 6b - 6

3b + 5 = 6b - 6

3(5b) = 6(-1b)

3b + 5 = 6b - 1

 -4(2d - 5) - 3 = 5(d - 2)

(step 1)

(step 2)

(step 3)

(step 4)
Which step above has an error?

 -8d + 20 + 12 = 5d - 10

Step 4

Step 2

 Step 1

Step 3

 -8d + 32 = 5d - 10

3
32 = 13d - 10
42 = 13d
13
3
= d
(Hint:  add like terms on left hand side first)
-3(4f -2) - 5f = 4f
-12f + 6 -

+17f         +17f

 + 6 = 4f

21       21

2

7
= 4f
= 21f
= f
Altres proves d'interés :

Prova creada amb That Quiz — el lloc de proves matemàtiques per a alumnes de tots nivells.