Plug In Values and Solve Equations

3(5x + 1) = 48

• x = 47/15

• x = 47

• x = 51

• x = 3

Solve:
7x + 19 = -2x + 55

• 4

• 14.8

• 8.2

• -4

Is (3,10) the solution to following system of equations? (3, 10) is an (x,y) pair, so plug (3,10) into x and y for BOTH equations. Does it make BOTH equations true?

• Yes

• No, it only makes the first equation true.

• No, it only makes the second equation true.

• No, it doesn't make either equation true.

What does that point where the two lines intersect tell you about the x and y in the 2 equations?

• When you plug in the (x,y) pair into both equations, it makes both equations true.

• When you plug in the (x,y) pair into both equations, it makes only one of the equations true.

• There is nothing significant about that point where they intersect.

• The two lines never intersect.

Set the equations equal to each other like you did in problem #11. Solve for x to find out how long you would have to rent the jet skis so the cost would be the same at either shop.

• About 5.3 hours

• About 0.1875 hours

• About 3 hours

• About 16 hours

Now plug your solution (x) into either Steve or BB's equation and solve for y to figure out what the cost would be.

• About $57

• About $48

• About $32

• They will never cost the same

The solution is:

• (4, 3)

• (3, 4)

• (-4, 3)

• No solution

What is the solution to the system?

• (0, 3)

• (1, -1)

• (-3, 1)

• (1, 3)

Solve the system of equations by graphing.

Hint: you can also plug in the x and y values to see which makes a true statement.

• (4, 7)

• (3, 5)

• (6, 7)

• (5, 3)

Solve the system of equations by graphing.

Hint: you can also plug in the x and y values to see which makes a true statement.

• (-3, 2)

• (-3, 6)

• (-3, -2)

• (-3, -6)