Question

?

1. What is the solution of the system
3x - y = 14,
4x + y = 21
A (-5,3)
B (4, -2)
C (5, 1)

Answer 1

The answer to your question is letter C

Explanation:

Equations

3x - y = 14 ----------- (I)

4x + y = 21 ----------- (II)

Solve the system of equations by the elimination method.

3x - y = 14

4x + y = 21

7x 0 = 35

Solve for x, divide both sides by 7

7x/ 7 = 35/7

x = 5

Substitute x in equation I

3(5) - y = 14

15 - y = 14

Subtract 15 in both sides

15 - 15 - y = 14 - 15

Simplify

- y = -1

Multiply by -1

y = 1

Solution

(5, 1)