Lesson 3️⃣ Substitution

Question 1

What happens in substitution

Answer 1

A letter takes the place of a number

Question 2

Evaluate the expression if…X=2…Y=4…K=3

3X

Answer 2

3×2
=6

Question 3

Evaluate the expression if…X=2…Y=4…K=3

16-4K

Answer 3

16-(4×3)
16-12
=4

Question 4

Evaluate the expression if…X=2…Y=4…K=3

4K-Y

Answer 4

(4×3)-4
12-4
=8

Question 5

Evaluate the expression if…X=2…Y=4…K=3

10X + Y - K

Answer 5

(10×2)+4-3
20+4-3
24-3
=21

Question 6

Evaluate the expression if…X=2…Y=4…K=3

°= INDICES BCS I DON’T HAVE THAT KEY

Y°2° + 2Y

Answer 6

4°2° + 2 (4)
16 + 8
=24

Question 7

Evaluate the expression if…X=2…Y=4…K=3

°= INDICES BCS I DON’T HAVE THAT KEY

3X + Y / 5

Answer 7

3°2° + Y / 5
6+4 / 5
10/5
=2

Question 8

Evaluate the expression if…X=2…Y=4…K=3

3XY

Answer 8

3 (2) (4)
3×2×4
=24

Question 9

Evaluate the expression if…X=2…Y=4…K=3

6 / XY

Answer 9

6 / (2) (4)
6/2×4
6/8
=3/4

Question 10

Evaluate the expressions when a=3 b=-2 c=-3

2b-c

Answer 10

2x(-2)-(-3)
-4+3
=-1

Question 11

Evaluate the expressions when a=3 b=-2 c=-3

a+5c

Answer 11

3+5x(-3)
3+(-15)
3-15
=-12

Question 12

Evaluate the expressions when a=3 b=-2 c=-3

4(b+c)

Answer 12

4(-2+-3)
4(-2-3)
4(-5)
=-20

Question 13

Evaluate the expressions when a=3 b=-2 c=-3

3bc

Answer 13

3x-2x-3
-6x-3
=18