Define your variables: Q: number of quarters D: number of dimes
Next, create your equations Q = 2D-4 25Q+10D=200
Because one variable (Q) is already written in terms of the other variable, D, you can already start solving with substitution. 25(2D-4)+10D=200 50D-100+10D=200 60D=300 D=5
Substitute D back into the other equation to find Q. Q=2D-4 Q=2(5)-4 Q=6
Substitute D and Q into the second equation to check. 25Q+10D=200 25(6)+10(5)=200 150+50=200
This works, so the answer is right! Bill has 6 quarters and 5 dimes.
Answer: 3. vertical line test a test used to determine if a graph is a function; states that a vertical line can only go through one point on the graph to be a function.
Reletive frequencey is (number of times desired outcomes happened)/(total times test was repeated) so 60=total times desired outcomes=20 20/60=1/3=0.3333333=33.33%=33%