1. Which ordered pair is a solution of the system of linear equations { x - 3y = -8 and y = 3x? * a.(1,-3)

b.(-1,3)

c.(3,1)

d.(1,3)

2. Which ordered pair is a solution of the system of linear equations {x + y = 6 and y = 2x ? *

a.(2,4)

b.(4,-3)

c.(4,2)

d.(-2,-4)

3. Which ordered pair is a solution of the system of linear equations { 2x + 3y = 9 and x = y + 2 ? *

a.(1,3)

b.(-1,2)

c.(3,1)

d.(-3,-1)

4.Which ordered pair is a solution of the system of linear equations { y = -3x + 7 and 5x - y = 8 ? *

a.(-1,2)

b.(2,1)

c.(-1,-2)

d.(1,2)

5.Which ordered pair is a solution of the system of linear equations { x + y = 10 and y = 4x ? *

a.(8,-2)

b.(-2,2)

c.(-2,8)

d.(2,8)

paki sagot napo, hilong hilo nako meron pakong 12 na sasagutan

C

D

B

B

A

Step-by-step explanation:

(b) 240

step-by-step explanation:

first, we use the pythagorean formula using the given side lengths to find x. then we use x to find the side lengths. then we add the side lengths to find the perimeter.

pythagorean theorem formula:

a^2 + b^2 = c^2

(x - 20)^2 + (x - 40)^2 = x^2

x^2 - 40x + 400 + x^2 - 80x + 1600 = x^2

x^2 -120x + 2000 = 0

(x - 100)(x - 20) = 0

x - 100 = 0 or x - 20 = 0

x = 100 or x = 20

we see that the solution x = 20 must be discarded because it will give a negative side length and a side length of 0. the only valid solution is x = 100.

perimeter = sum of the lengths of the sides

perimeter = x + x - 20 + x - 40

perimeter = 3x - 60

replace x with 100.

perimeter = 3(100) - 60

perimeter = 300 - 60

perimeter = 240