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2 answers:
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Instead of using an = sign we use 
becuase its less than or equal to 100 dollars.
The equation of the line is y=10x+7
sub in 100 for y and the inequallity sign
10x+7100
solve so x is isolated
10x93
x9.3
technically the answer is 9 because you cant buy a fraction of a CD
The equation of the line is y=10x+7
sub in 100 for y and the inequallity sign
10x+7
solve so x is isolated
10x
x
technically the answer is 9 because you cant buy a fraction of a CD
Answer
Step-by-step explanation
You would use the pythagorean theorem for this problem. The point on the y-axis is 5 away from (0,0). The point on the x-axis is 3 away. You would square these, leading from
5+3 to
25+9=
Answer is .