Answer: x+8
The term 'sum' means 'result of adding two (or more) numbers or expressions'.
All you have to do is substitute the y value from the 1st equation into the second equation and solve...
a) y= 2-x
5x + 4y = 5
Substitute (2-x) into the second equation anywhere there is a y...
5x + 4y = 5
5x + 4(2-x) = 5
Now solve
5x + 8 - 4x = 5
5x - 4x + 8 = 5
x + 8 = 5
x = -3
Now that you have a solution for x, substitute -3 into either of the original equations anywhere there is an x then solve for y...
y = 2 - x
y = 2 - (-3)
y = 2+3 = 5
You solved for x and got -3 and solved for y and got 5, so your solution set is
(-3, 5).
Now check it by substituting both numbers into one of the original equations and you should have a true statement if it is correct...
y = 2 - x
5 = 2 - (-3)
5 = 2+3
5 = 5
True statement... it checks!
note* during the check, if the equation would have worked out to something like 2 = 5, then that is a false statement therefore the solution set would be wrong and you'd have to go back and find the mistake.
Answer:
y=25
Step-by-step explanation:
10*2=20
20+5=25
See attachment for math work and answer.
Answer:
We have been given the step function:
We need to find the function from the given graph
The function will be 
Whenever we put different values of y we will get the values of y which should be the value according to the graph.
We will convert 121 min in hours since, graph shows the x-axis in hours.
hours
So, since we need to find cost to park for 121 minutes or 2.01 hours we will put x=2.01 in the formed function above:
And 
being a floor function which always consider the next integer to the decimal inside the function.
is the cost for 121 minutes or 2.01 hours
Therefore, option c is correct that is $6.
