What is 27x+54y=21,6-22.5x+45y=90 ?

The solution to 27x+54y=21,6-22.5x+45y=90 is x=-1.47777…,y=1.12777…

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27x+54y=21,6-22.5x+45y=90

27 x + 54 y = 21, 6 - 22.5 x + 45 y = 90

x = - 1.47777 \dots, y = 1.12777 \dots

Solution steps

[27 x + 54 y = 21 6 - 22.5 x + 45 y = 90]

Isolate

x

for

27 x + 54 y = 21 : x = \frac{7 - 18 y}{9}

Substitute

x = \frac{7 - 18 y}{9}

[6 - 22.5 \cdot \frac{7 - 18 y}{9} + 45 y = 90]

Simplify

[90 y - 11.5 = 90]

Isolate

y

for

90 y - 11.5 = 90 : y = 1.12777 \dots

For

x = \frac{7 - 18 y}{9}

Substitute

y = 1.12777 \dots

x = \frac{7 - 18 \cdot 1.12777 \dots}{9}

\frac{7 - 18 \cdot 1.12777 \dots}{9} = - 1.47777 \dots

x = - 1.47777 \dots

The solutions to the system of equations are:

x = - 1.47777 \dots, y = 1.12777 \dots

8 y - 8 x = 30, 50 x - 12 y = 4

x + 3 y = 6, 2 x - 3 y = 12

3 x - y = - 3, 2 x + y = 8

3 x + 5 y = 21, 4 x - 2 y = 2

x + y = 5, 3 x + y = 18

What is 27x+54y=21,6-22.5x+45y=90 ?
The solution to 27x+54y=21,6-22.5x+45y=90 is x=-1.47777…,y=1.12777…