If shapes are congruent, then they are mathematically equal (same dimensions, angles etc.). So just locate where the angle x is on both triangles, it should have a value on or a calculable value on the other. If you provide us with the actual sheet I could walk you through it.
Answer:

Step-by-step explanation:
Standard form is written this way: 
However, in this case, we just have to simplify 8x-3y=6-4x, as it is already mostly in standard form.
So, to do this, we have to combine like terms.
The only like terms that can be combined are -4x and 8x.
So, we add 4x to both sides, and we get:
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Answer: 5x + 2
Step-by-step explanation:
Answer:
Last one
Step-by-step explanation:
The minus infrot makes it open Down
Its x-... So it - 1
The other number keeps the -