1. Solve the following system of equations graphically… Solving for values of X and Y;
3x-4y=24;
x: O 12 16 20
y: -6 3 6 9
3x+2y=6;
x: 2 4 6 8
y: 0 -3 -6 -9
The point where the two lines intersect gives the solution to the equation. This is x=4 and y= -3
2. Show that (2, 5) is or is not a solution to the system of equations: 5x-4y=20 2x-3y=-1
If (2,5) is a solution to the equations, then x=2 and y=5
Substituting this values into the equations, 5(2)-4(5)=20
10-20=20, this is not true
Also 2(2)-3(5)=-1
4-15=-1, this is not also true-therefore these value are not a solution to the given equation.
3. Solve the system of equations by substitution. x+3y=5; 4x+5y=13
x+3y=5;
Reverse equation
x=-3y+5
Substituting x in equation 2 then solving for y;
4x+5y=13
4(-3y+5) +5y=13
-12y+20+5y=13
-7y=-7
y=1
Back substituting this y-value into the revised first equation;
x=-3y+5
x=-3(1) +5
x=2
Solution is (2, 1).
4. Solve the system of equations by elimination (addition) 7x+2y=5 2x+3y=16
You obtain the opposite coefficients of y by multiplying the first equation by 3 and the second equation by 2.
3(7x+2y=5) = 21x+6y=15
2(2x+3y=16) = – 4x+6y=32
_________
17x =-17
x=-1
Substitute x in the first equation
7(-1) +2y=5
-7+2y=5
Y=6
Solution is (-1, 6).
5. A candy manufacture sells 60 pounds of a candy mix for$66. It is composed of two candies, one worth $.90 a pound and the other is worth $1.50 a pound. How many pounds of each should be in the 60-pound mixture?
Let one of the candies to be A and the other to be B.
A+B=60
(0.9)A+(1.5)B=66
A=60-B; and 0.9A=66-1.5B or A=(66-1.5B)0.9
Therefore; 60-B=(66-1.5B)0.9
60-B=73.33-1.66B
0.66B=13.33
B=20.197
Since A=60-B
A=60-20.197
=39.803
6. Draw the graphs of systems of equations that are consistent, inconsistent, and dependent.
7. Determine whether or not {(1, 2), (4, 4), (5, 4), (7, 8)} is a function and then list the domain and range
Any given set represent a relation because the x’s and y’s are being related to each other. In the above set there are two points of y-value which are similar: (4. 4) and (5, 4). Therefore since y=4 gives two possible destinations then this relation is not a function.
Domain=Set of all input values of x= {1, 4, 5, 7}
Range=Set of all input values of y= {2, 4, 4, 8}
8. Find the domain of f(x) = Square root of x+2
The expression defining function f contains a square root hence the domain must positive or zero. The expression under the radical has to satisfy the condition
x +2 >= 0 for the function to take real values.
The domain, in interval notation, is given by
(+infinity, +2)
9. Explain, in words, how to use the vertical line test to determine if a graph is a function.
The vertical line test provides an easy way to check whether the equation that has been graphed is a function. The vertical line test states that a graph is the graph of a function if no vertical line intersects the graph more than once. To use the vertical line test, you look at a graph and determine if there are any places where a vertical line intersects the graph more than once. If you cannot find any such places, then this is the graph of a function. If you can, then this is not the graph of a function.