1. what is the y intercept, and what dose it represent? (must contain both questions for full credit)
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2. what is the slope, and what dose it represent? (must answer both questions for full credit)
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3. what is the equation of the line?
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4. what dose the ordered pair (4,120) represent l in context of this problem?

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.