Answer:
b.
Step-by-step explanation:
Answer:
-8a - 7b - 7c
Step-by-step explanation:
-8a - 2b - 10c - (5b - 3c)
Negate 5b and -3c
-8a - 2b - 10c - 5b + 3c = -8a - 7b - 7c
To solve the two equations simultaneously using the substitution method we need to rearrange one of the equation to make either
or
the subject.
We can try in turn rearranging both equations and see which unknown term would have been easier to solve first
Equation
Making
the subject
, dividing each term by 2
⇒ (Option 1)
Making
the subject
, multiply each term by 8 gives
⇒ (Option 2)
Equation
Making
the subject
, divide each term by 3
⇒ (Option 3)
Making
the subject
, divide each term by 8
⇒ (Option 4)
From all the possibilities of rearranged term, the most efficient option would have been the first option, from equation
with
as the subject,
Answer:
C.
Step-by-step explanation:
First subtract the endpoints and then divide by 2.
The scale of the graph makes it difficult to read the y-intercept, we choose to do part B first.
B. The graph appears to go through the point (1, 5) and (5, 12), so will have equation
.. y = (12-5)/(5-1)*(x -1) +5
.. y = (7/4)x +3 1/4 . . . . . . . . . . equation of the line
Then for x=13, you have
.. y = (7/4)*13 +3 1/4
.. y = 26
The predicted number of matches won is 26.
A. From part B, the y-intercept is 3 1/4 (looks approximately like that on the graph). It represents the number of matches won if students don't practice at all.