It's kinda like using variables, but shapes in their place. Let's set the circle to x, the triangle to y, and the square to z. Now the equations say x+(y+z)=13, (y+z)=8, and x+y=7. First thing we can do it plug 8 into the first equation for y+z, getting x+8=13. Subtract 8 to both sides and x (or circle) equals 5. Plug 5 into the last equation, x+y=7 to solve for y, getting 5+y=7. Subtract 5 to both sides and y (or triangle) equals 2. Finally, plug two in for y in y+z=8, getting 2+z=8. Subtract 2 from both sides and z (or square) equals 6. Hope I've explained it clearly!!
Answer:
B is correct
Step-by-step explanation:
The person is mentioned is Phil. His amount of money and number of miles are proportionally related (Clark's amount of money and number of miles are not proportionally related due to initial donation)
For Phil, y = ax is his model.
Look into the graph, we can see there is a point where y = 30 and x = 4.
Then rate = 30/4 = 7.5
Determine how much of the job they have finished by calculating:
2/4 + 2/6 = 1/2 + 1/3 = 5/6 of the job has been done.
So, they have 1/6 of the job to go.
Then we write the following fractional equation:
t/4 + t/6 = 1/6
Multiply all by 12 (the LCD) and get
3t + 2t = 2
5t = 2
t = 2/5 hour = 24 minutes.
Understand?
20 because 4/5 is 16 so 4•5=20 like 4•4=16
