<u>Answer</u>:
Therefore has one solution.
<u>explanation</u>:
Given equations:
6x + y = -7
-24x -7y = 25
Make y the subject:
6x + y = -7
y = -7 - 6x ..............equation 1
-24x -7y = 25
-7y = 25 + 24x
y = (25 + 24x)/-7 ..........equation 2
Solve them simultaneously:
(25 + 24x)/-7 = -7 - 6x
25 + 24x = -7 (-7 - 6x)
25 + 24x = 49 + 42x
42x - 24x = 25- 42
18x = -24
x =
Then y is:
y = -7 - 6x
y = -7 - 6( )
y = 1
Has one separate value of x and y: ( , 1 ); so it has one solution.
Answer: First option.
Step-by-step explanation:
Marta needs to subtract from both sides of the equation:
Now she needs to divide both sides of the equation by , then:
Rewriting:
Simplifying, she should get:
This matches with the first option.
First of all, don't let "b" confuse you. Know that b = 5/6k = -10, so all you really have to solve for this problem is .
Before anything else, you have to isolate k. Do this my multiplying both sides by the reciprocal of 5/6.
The 6/5 and 5/6 cancel each other out, so we are left with
-->
--->
So k = -12.
Hope this helped. Good luck.
