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Snowcat [4.5K]
3 years ago
7

Ryan is trying to determine whether 2.7x – 5.9 is equivalent to 2.8x – 5.9. To test this, he substitutes 0 for x into both expre

ssions. Explain why this will not give him the correct answer.
Mathematics
2 answers:
torisob [31]3 years ago
7 0
Because 2.7*0 = 0  and 2.8*0 = 0

He needs to plug in some other value like x = 1
Bogdan [553]3 years ago
7 0
Each of the 2 expressions given is a linear function of the form y = mx + b.
These two fundtions have the same y-intercept:  -5.9, but the slopes of the two lines are different.  In both cases, f(0) = 0 - 5.9, but this does not indicate that 2.7x-5.9 = 2.8x-5.9 in general.

If Ryan were to subst. 1 for x in these two functions, the results would not be identical:  2.7(1) - 5.9 and 2.8(1) - 5.9.

Hope Ryan comes to realize that this test of his will not give him the correct answer.

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