Question

1. What is the effect on the graph of f(X) f it is replaced by the graph 1/7*f(x)?
A. vertically stretches
B. horizontally compresses
C. vertically compresses
D. horizontally stretches

2. Solve the system of equations using the substitution method. 14x-2y=18 y=7x-9

3. solve by the elimination method 5x-4y=1 -10x+8y=-2

Answer 1

1. 1/7 is smaller than 1, so the graph would be compressed vertically.


2.
14x-2y=18
y=7x-9

Just plug the second equation into the first, and solve for x, like so:
14x-2(7x-9)=18
now solve for x. Then once you have x, use it to find y.

3.
5x-4y=1
-10x+8y=-2
Multiply the first equation by 2:
10x-8y=2
-10x+8y=-2
Now add them together

Answer 2

For number 2 would x=98?

Answer 3

No, show your work.

Answer 4

14x-2(7x-9)=18
14x*7x=98x
-2*-9=18
98x+18=18
-18 -18
98x

Answer 5

Can't follow what you're doing...

14x-2(7x-9)=18
distribute the -2 into the brackets:
14x - 14x + 18 = 18
Now simplify.

Answer 6

do I add the like terms together?

Answer 7

Yes

Answer 8

so it would 28x?

Answer 9

*so it would be

Answer 10

14x - 14x + 18 = 18

First, what's 14x - 14x?

Answer 11

0

Answer 12

So now finish this:
14x - 14x + 18 = 18

Answer 13

0x+18=18
+18 +18
18x=1?

Answer 14

0x is still 0.

14x - 14x + 18 = 18

0 + 18 = 18

Answer 15

So x=0?

Answer 16

There is no x, it's gone.

18 = 18

Is that true for all values of x, or no values of x?
Hint: no matter what value x is, 18 will always be equal to 18.

Answer 17

y=7(18)-9
y= 117 ?

Answer 18

or y=7(0)-9
y= -9?

Answer 19

Re-read my last reply.

Answer 20

I'm still confused..

Answer 21

Answer the question in my last reply, use the hint.

Answer 22

doesn't make sense at all to me.

Answer 23

18 = 18 is always true, ie true for all values of x. Meaning that:
14x-2y=18
y=7x-9
has infinite solutions.

Answer 24

Okay thanks