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Mathematics 9 Online
OpenStudy (anonymous):

Find 4x - 5y if x = -5, y = 3

OpenStudy (mertsj):

Can you multiply?

OpenStudy (anonymous):

Just sub in the given values: \[4*(-5)-5*3\]

OpenStudy (mertsj):

4x means 4 times x and 5y means 5 times y

OpenStudy (anonymous):

but my answers that i have to go with are -5 5 35 -35

OpenStudy (mertsj):

Well what is -20 -15?

OpenStudy (king):

-35..

OpenStudy (anonymous):

4*-5 is -20 and -5*3is -15

OpenStudy (anonymous):

is it -35 or -15?

OpenStudy (anonymous):

subtracting from a negative, means it gets more negative

OpenStudy (anonymous):

so its -5?

OpenStudy (anonymous):

lets put it this way \[-(20+15)\] here you've taken out the negative sign

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