Look at the system of equations below. x +y +z = 2
2x + 3y - z = -3
3x + y + z = 4
What is the product of x and y?

Step-by-step explanation:

Given the system of equation;

x +y +z = 2 1

2x + 3y - z = -3 2

3x + y + z = 43

Add 1 and 2;

x+2x + y + 3y = 2-3

3x + 4y = -1 4

Add 2 and 3

2x+3x + 3y + y = -3+4

4x + 4y = 1 5

Equate 4 and 5 and solve;

3x + 4y = -1 4

4x + 4y = 1 5

Subtract

3x - 4x = -1-1

-x = -2

x = 2

substitute x - 2 into 4;

From 4; 3x+4y = -1

3(2) +4y = -1

6 + 4y = -1

4y = -1-6

4y = -7

y = 7/-4

y = -7/4

Product of x and y = 2 * -7/4 = -7/2

because they could drop even lower..

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer