Question

7x - 8y = - 12 and - 4x + 2y = - 18

Answer 1

Answer:

We think you wrote:

7x-8y=-12;-4x+2y=3

This deals with linear equations with two unknowns.

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1 result(s) found

{x,y}={

19832072

0

,

2

3

}

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Step by Step Solution:

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System of Linear Equations entered :

[1] 7x - 8y = -12

[2] -4x + 2y = 3

Graphic Representation of the Equations :

-8y + 7x = -12 2y - 4x = 3

Solve by Substitution :

// Solve equation [2] for the variable y

[2] 2y = 4x + 3

[2] y = 2x + 3/2

// Plug this in for variable y in equation [1]

[1] 7x - 8•(2x+3/2) = -12

[1] -9x = 0

// Solve equation [1] for the variable x

[1] 9x = 0

[1] x = 0

// By now we know this much :

x = 0

y = 2x+3/2

// Use the x value to solve for y

y = 2(0/19832072)+3/2 = 3/2