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The equation given is y=3x - 4.
The y-intercept is the value of y where x = 0. An aside, the x-intercept will be the value of x when y = 0.
Set x = 0 in the equation. You have y = -4. Hence, the y-intercept of the line is (0,-4).
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Because 3 x 4 = 12
-7.5?
the answer is 12 3x4 equals to 12
I does not so the question is misguided.
Yes. Before using the polynomial for any productive purpose, it would have to be cleaned up and simplified. In that process, the +3x4 and -3x4 would go away, and the highest-order term remaining would be the 4x3.