Question

0,4x - 5y = 27

2x + 0,2y = 9

x = ?

y =?

Answer 1

Answer:

x=5.5 y=-1

Step-by-step explanation:

4x-5y=27

2x+2y=9

Multiply 2x+2y=9 by 2

We get 4x+4y=18

subtracting both equation we get y=-1,x=5.5

Answer 2

Answer:

x = 5

y = -5

Step-by-step explanation:

0.4x -5y = 27 -----------(1)

2x + 0.2y = 9 -----------(2)

we need to make either x or y equal in both equations

I'll use x

multiplying equation 1 by 5, it becomes

2x - 25y = 135 ------------(3)

and equation 2 becomes 2x + 0.2y = 9 ------------(4)

2x - 25y = 135

2x + 0.2y = 9

subtracting eq. 4 from eq. 3

2x - 25y -2x - 0.2y = 135 - 9

-25.2y = 126

y = -5

thus, fron eq. 2

2x +0.2×-5 = 9

2x - 1 =9

2x = 10

x = 5

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