For this case we have the following system of equations:

Equating the equations we have:

Adding 3x to both sides of the equation:

Subtracting 9 from both sides of the equation:

Dividing between -3 on both sides of the equation:

We look for the value of "and":

Thus, the solution of the system is (2, -3)
Answer:
(2, -3)
Answer: He will need to stop 9 times.
Step-by-step explanation:
3150/320 = (about) 9
Answer:
b
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Since those lines are parallel, those two angles are equal. Therefore:
3x+15=105
3x=90
x=30