If 2 raised to the power of x = 10 , then 2 raised to the power of x-1 = ?
1 answer:
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Given:
y varies directly with x,
It is given that y = 7 when x = -9.
To find:
The value of y when x = 27 for the direct variation.
Solution:
It is given that y varies directly with x, so
...(i)
Where, k is the constant of proportionality.
It is given that y = 7 when x = -9. Putting these values in (i), we get
Putting in (i), we get
Putting , we get
Therefore, the required value is .
Answer:
7a) m=2x
7b) m=-3/4x
8)m=-5x
9) m=1/10x
10) 1/4x
Step-by-step explanation: So first what you want to do is take two points from your graph that you see that your line is on.
for example, on a), you would take lets say (3,2) and (0,-4)
*tip! if your X and Y intercepts are whole numbers it will be best to use them but if not, any two points will work.
so then you would first take your y coordinates of each point and plug it into the equation, .
so lets break it down!
so lets first take our y coordinates, (3,2) and (0,-4) and plug them into the equations
so then lets subtract! -4 -2 gives us -6. so the numerator is -6.
lets now plug in our x values (3,2) and (0,-4)
after we do the subtraction, we get -3 as our denominator.
so we are left with -6/-3. so -6/-3 gives us a slope of 2.
therefore you have Y=2x+b
Hopes this helps :)!