How to solve the system of equation 500y-600x=2800 , 400y-400x=2400 by elimination

me solve this, i have about 3 hours and i dont understand how to solve this

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Step-by-step explanation:

Given:

Equation 1:

Simplifying the above equation by dividing both sides by 100

Equation 2:

Simplifying the above equation by dividing both sides by 400.

Now the system of equation is:

(1a)

(2a)

Solving by elimination

Multiplying equation (2a) with

(2b)

Adding equations (1a) and (2b) in order to eliminate

+  

We get

∴

Plugging in equation (2a).

Adding both sides.

∴

the last choice

step-by-step explanation:

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step-by-step explanation: