Question

SOLVE USING ELIMINATION *20 POINTS*


1. 3x - y = 28

3x - y = 14


a. (8,-4)

b. (-7,7)

c. (7,-7)

d. (-4,8)


2. x+ 4y 13

2x + 3y 6


a. (3,5)

b. (-3,4)

C. (4,5)

d. (4,4)


3. 12r-9y 30
6x + 15y = 54


A. x = 4 and y 2

B. x = 2 and y = 4

C. x = 14 and y 2

D. x = 37/7 and y =26/7







4. x + 3/2 y = -3




6/7x + 7y = -8


A. (27/8, -1/4)

B. (9/2, -5)

C. (-3/11, -10/11)

D. (-63 / 40, -19/20)

Answer 1

1. No answer ( may be due to incorrect question)

2. x = -3

y = 4

3. x= 4

y = 2

4.x = -63/40

y= -19/20

Step 1

Multiply equation 1 by the coefficient of x in equation 2

Multiply equation 2 by the coefficient of x I'm equation 1

(after completing this step you will derive equation 3 and 4 )

Step 2

Subtract equation 4 from equation 3

Step 3

Divide both sides of the equation by the coefficient of y

Step 4

substitute your value for y in equation 1 or 2

(after this you will derive the values of x)

Note : This method is for the Elimination of x

I hope it helps

Answer 2

Answer: A.  X = 11

Step-by-step explanation:

x - 7 = 4

11 - 7 = 4