Congruent because you can map the triangles using a reflection across the y-axis which is a rigid motion
You would need to go in the order of pemdas
$50 corresponds to 4 kg
That means there must be a number that when you multiply by 4 you get 50.
Let that number be k. k is the price of cheese per kg.
1 kg: y = k * 1
2 kg: y = k * 2
Answer: x+y
Step-by-step explanation: 4x-4y-3x-3y
4x-3x is x
4y-3y is y
Answer:

Step-by-step explanation:

Apply cross product property
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Distribute 5 through the parentheses
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Distribute 6 through the parentheses
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Move 6x to left hand side and change it's sign
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Collect like terms
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Move 30 to right hand side and change it's sign
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Calculate
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Divide both sides of the equation by 9
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Calculate
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Hope I helped!
Best regards!!