Substitution

Question 1

(a=10, b=8)

2b +a

Answer 1

(2x8) + 10
16 + 10

= 26

Question 2

(a=12,b=3)

4a/2b

Answer 2

(4x12) / (2x3)
48/6

= 8

Question 3

(a=7,b=8)

20a + b^2

Answer 3

(20x7) + (8^2)
140 + 64

= 204

Question 4

(a=5,b=3,c=6)

5^2 - b^3 + (c^2x2)

Answer 4

(5^2) - (3^3) + ((6^2)x2)
25-27+(36x2)
-2+72

=70

Question 5

a=5+12

Answer 5

12+5=17

Question 6

12a=39-3

Answer 6

39-3=36
36/12=3

Question 7

(a=5,b=2)

c=3a+2b

Answer 7

(3x5)+(2x2)
15+4=19

c=19

Question 8

(x=2)

t=3x^2

Answer 8

2^2=4
4x3=12

t=12

Question 9

(a=14,h=-7)

a=gh/2

Answer 9

14=g x -7/2
14x2=28
28/-7= -4

g=-4

Question 10

(p=-3,q=-4)

y=p^2 + q^2

Answer 10

-3^2=9
-4^2=16
9+16=25

y=25