Answer:
x = days he reads for 4.5 hours = 1 day
y = days he reads for 3.5 hours = 6 days
Step-by-step explanation:
Let
x = days he reads for 4.5 hours
y = days he reads for 3.5 hours
x + y = 7 (1)
4.5x + 3.5y = 25.5 (2)
From (1)
x = 7 - y
Substitute x = 7 - y into (2)
4.5x + 3.5y = 25.5 (2)
4.5(7 - y) + 3.5y = 25.5
31.5 - 4.5y + 3.5y = 25.5
- 4.5y + 3.5y = 25.5 - 31.5
-y = -6
y = 6
Substitute y = 6 into (1)
x + y = 7 (1)
x + 6 = 7
x = 7 - 6
x = 1
x = days he reads for 4.5 hours = 1 day
y = days he reads for 3.5 hours = 6 days
Answer:
C. x=-4.5
Step-by-step explanation:
To solve, you need to Isolate the variable
To do this, you need to get rid of the -2.9 next to the x
Do this by adding (it cancels out the -2.9 on the left side) 2.9 to the WHOLE EQUATION.
This leaves you with x=-4.5 or C
I think the correct answer from the choices listed above is option D. If you wanted to shift the graph of y = 4x + 7 down, then you should use the equation <span>y = 4x + 3. Hope this answers the question. Have a nice day.</span>
Answer:
B) 40 feet
Step-by-step explanation:
Essentially, there are two similar right triangles in the given problem.
base_<em>L </em> = Base [larger triangle] = 60 ft
base_<em>S </em> = Base [smaller triangle] = 6 ft
x = leg (larger triangle)
y = leg (smaller triangle) = 4 ft
Using the given proportion to solve for the value of x:
6x = 240
Divide both sides by 6:
6x/6 = 240/6
x = 40