You would need to isolate the "X" variable because it is common in all 3 equations.
Answer:

Step-by-step explanation:
6 = −3[2] + b
−6

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Answer:
3/28
Step-by-step explanation:

that dot is a multiplication sign, right?
Answer:
the answer is the initial value (y - coordinate of the y- intercept
Step-by-step explanation: Notice that the two equations in this problem have the same slope of -1/4 but different y-intercepts.
When lines have the same slopes, they are parallel.
Parallel lines never meet/intersect so there is no solution.