to put them together and add them.
Answer:
The value 4.5 is rational and the value 15−−√ is irrational. The sum of 4.5 and 15−−√ has a non-repeating and non-terminating decimal expansion. Therefore, the sum of 4.5 and 15−−√ is irrational. I can't explan but that's the correct Answer
The answer is (3,0)
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The equation of the line is (slope-intercept) y=

x+(-7) or (standard form)

x+y=-7