Question

Find the value of the following expression if x = 2 and y = 7 (a) 8x+y (b) 3(y-x) (c) 3x+2y (d) 7x by 2x (e) 2x+y (f) 5xy

Answer 1

Answer:

a= 23

b= 15

c= 20

d= 0

e= 11

f= 70

Step-by-step explanation:

a 8×2+7

16+7

23

b 3(7-2)

3×5

15

c 3×2+2×7

6+14

20

d 7×2/2×7

14/14

0

e 2×2+7

4+7

11

f 5×2×7

70

Answer 2

Answer:

a) =23,b) = 15,c) = 20, d) = 2.5, e) = 11, f) = 28

Step-by-step explanation:

a) 8x + y

Put x=2 and y= 7

= 8(2) + 7

= 16 + 7

= 23

b) 3(y-x)

Put x= 2 and y =7

= 3(7-2)

= 3(5)

= 15

c) 3x + 2y

Put x = 2 and y =7

= 3(2) + 2(7)

= 6 + 14

= 20

d) 7x by 2x

= 7x/2x

Put x = 2

= 7(2) / 2(2)

= 14 / 4

= 2.5

e) 2x + y

Put x = 2 and y = 7

= 2(2) + 7

= 4 + 7

= 11

f) 5xy

Put x = 2 and y =7

= 2(2)(7)

= 28