Question

Find 3x - y - 3z if x = -2, y = 1, and z = -2.

Answer 1

Just plug in the numbers whenever you see the corresponding variable.

Answer 2

i dont get it

Answer 3

For every x, you would replace it with -2, every y with 1, and every z with -2

Answer 4

idk how to solve it

Answer 5

plug the numbers in 3(-2)-(1)-3(-2) into your calculator or solve it your self now.

Answer 6

you basically just put the numbers that correspond with the letter, it turns into an equation that you can easily solve

Answer 7

i got -12?

Answer 8

did you but them in parentheses?

Answer 9

the answer should be -1

Answer 10

Write an expression for the following real-world situation.
If Mr. Jackson earns $1000 for every used car he sells and $2000 for every new car he sells, how much would he make if he sold "u" used cars and "n" new cars?

Part 2: Write a real-world situation of your own and a VARIABLE expression to go with it. can you teach me how to do this ?

Answer 11

yeah
one sec

Answer 12

okay thank you

Answer 13

Part 1: Write an expression for the following real-world situation.
If Mr. Jackson earns $1000 for every used car he sells and $2000 for every new car he sells, how much would he make if he sold "u" used cars and "n" new cars?
This means he earns 1000u+2000n dollars for all the cars he sells in total. You could simplify this to 1000(u+2n), but depends on whether you have learnt factorising or not.
Part 2: Write a real-world situation of your own and a VARIABLE expression to go with it.
Write the question you got in part one down but in different words like:
Bob goes to the shop and buys some apples and pears, apples cost $3 and pears cost $5, how much would he pay if he bought "a" apples and "p" pears?
TOTAL COST ($) = 3a+5p

Answer 14

Thank you so much !

Answer 15

You're welcome anything else?