PLEASE ANSWER

Look at the graph of the system of equations: 5x-3y= -3 and x + 3y =21
How can you prove that the point of intersection of the lines on the graph is the solution to both equations?

A. Substitute 6 as the x value in each of the equations and solve for y.
B. Substitute 7 as the y value in each of the equations and solve for x
C. Substitute 3 as the x value in each of the equations and solve for y.
D. Substitute 1 as the y value in each of the equations and solve for x.

C. Substitute 3 as the x value in each of the equations and solve for y.

Step-by-step explanation: When you plug in 3 as x in both equations, you get 6 for both. The other ones gives you two different answers.

d. $180

step-by-step explanation:

if the dimensions of the room is 9ft by 12 ft, we have the area of the floor as,

so the area of the floor is 108 square feet, converting that into square yards we get,

the cost of carpet is $15 per square yard, therefore the cost of carpet for 12 square yards is,

hence, the cost of carpet is $180.

assuming the dimensions of the room be,

15 ft by 12 ft

so, the area of the floor of that room is,

we can convert 180 square feet into square yards, we know that,

1 sq ft = 0.111 sq yard

so, 180 square feet is,

so the area of floor is 20 square yards.

now, the cost of carpet is 15 dollars per square yard, therefore the cost of carpet for 20 square yards is,

so, it will cost $300.

final total: 63

step-by-step explanation:

60 times sales tax

60 times 0.05

3

60 + 3

63