Question

can someone help me with #6 and #7?

Answer 1

well for the first one
we can see that y=3
and also that the width is 4
so 4=3-x
x=-1

Answer 2

can you write down the equations for question 7?

Answer 3

what equation?

Answer 4

I asked first.
use the idea that opposite sides of a parallelogram are equal

Answer 5

ya..i know you asked first. clearly i dont know what equation you are referring to.

Answer 6

for question 7 use the idea that opposite sides of a parallelogram are equal
to write down 2 equations.

Answer 7

BA =CD?

Answer 8

yes, but use the "values" they are given

Answer 9

2x=7?

Answer 10

pretty close, but AB is not just 2x. you missed -y

Answer 11

2x-y=7 ...

Answer 12

correct!

Answer 13

Can you write down one other equation that relates BC and AD?

Answer 14

you need 2 equations to solve for x and y (2 unknowns x and y mean you need 2 equations)

can you write down the other equation?

Answer 15

x+y=2

Answer 16

ok now we have
x+y=2
2x-y= 7

it is time to do algebra
do you know how to add these 2 equations together?

Answer 17

2x+x?

Answer 18

@phi

Answer 19

add both sides like this
x+ y + 2x -y = 2+7

can you combine "like terms" ? if you have 1 x and add 2 x's how many x's do you get?
if you have 1 y and take away 1 y, how many y's do you have?

Answer 20

can you simplify the right hand side? 2+7 = ?

Answer 21

9

Answer 22

@phi

Answer 23

ok...lets pick up from where phi left off! so what is 1x + 2x?

Answer 24

3x

Answer 25

right! and y-y?!

Answer 26

0?

Answer 27

perfect! so now you have...3x = 9! so..can u find out what "x" can possibly be?

Answer 28

3?

Answer 29

correct!! now put that value of x in any of the equations and solve for y....so... if u want to choose the first one... u say...3 + y = 2 ...can u find out the value of y?

Answer 30

3+3=2?

Answer 31

come on! 3 + 3 is 6! not 2!!

Answer 32

i'll give u a hint! it has to be a negative number!!

Answer 33

clearly! I know that i was plugging in 3 for Y!

Answer 34

u know this! lets say, you have 3 apples...and ate some, and u ended up with only two apples! so, how many did you eat?

Answer 35

1

Answer 36

perfect!!! in this scenario, u ate one! mathematically, u can call this as -1! :D
and there's your values for x and y!!

Answer 37

thank youu! :)

Answer 38

glad to help! and thanks to @phi also!

Answer 39

yes!