Point of Intersection by Substitution

The cost of making copies at two separate stores is represented by the system of equations. According to the graph, ​ (a)   copies must be made for the cost to be the same, which is ​ (b)   dollars.

• 15

• 5

• 20

• 0

• 3

y = -20 y = 2x - 8

• (20,6)

• (-6,20)

• (-6,-20)

• (6,-20)

y = -2x + 18
y = 8

• (5, 8)

• (-5, 8)

• (2, 8)

• (-2, 8)

The cost of making copies at two separate stores is represented by the system of equations. According to the graph, (a)   copies must be made for the cost to be the same, which is (b)   dollars.

• 15

• 5

• 20

• 0

• 3

The graph above represents the allowance that Stefin and Daniel receive every week. If the x-axis represents the number of weeks and the y-axis represents the earnings ($), what is the amount of earnings that both boys will have the same?

• $4

• $2

• $6

• $8

Find the point of intersection for the system of equations.

• (-3, -1)

• (-3, 11)

• (-3, 7)

• (-3, 1)