There are 40 centimeters in 400 millimeters
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You multiply both of the equations until you have two of the same term the same like for example, say I have 4x and 5x. You want to multiply until both have the same number, so multiply 5x by four, then multiply 4x by five, and you will get 20x, then both of those cancel out and you will be left with the other variable, and you just solve like a normal equation.
It has to be the first one
Yes, the angles are the same as the shape is smaller, but it will be a different size
