Question

solve the following systems of equations: 1. 0.4x + 0.3y = 17 0.7x - 0.2y = 0.8​

Answer 1

Answer:

x = 38 y =17.8

Step-by-step explanation:

0.4x + 0.3y = 17......... (1)

0.7x - 0.2y = 0.8...........(2)

multiply equation (1) by 2 nd equation (2) by 3

and add them

2.1x-0.6y=51

-

0.8x + 0.6y=1.6

1.3x = 49.4

x = 58

substitute the value of x in equation (1) or (2)

u will get y = 17.8

hope it will help u ❤️

Answer 2

Step-by-step explanation:

0.4x + 0.3y = 17

0.7x - 0.2y = 0.8

0.4x = 17 - 0.3y

x= (17-0.3y)÷0.4

0.7× ( 17-0.3y )÷0.4 - 0.2y = 0.8

119/4 - 0.21y/4 - 0.2y = 0.8

-1.01y = 0.8 - 29.75

y = 29.67/1.01

y= 29.37

x = (17 - 0.3×29.37 )÷0.4

x= (17- 8.8)÷0.4

x= 8.2÷0.4

x= 20.5