 Mathematics
2 June, 20:08

# Solve the system of equations using row operations. Write your answer in the form (x, y).{2x+3y=-2{3x-y=19

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Answers (1)
1. 2 June, 21:59
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(5, - 4)

Step-by-step explanation:

Given the 2 equations

2x + 3y = - 2 → (1)

3x - y = 19 → (2)

Multiplying (2) by 3 and adding to (1) will eliminate the y - term

9x - 3y = 57 → (3)

Add (1) and (3) term by term to eliminate y

(2x + 9x) + (3y - 3y) = ( - 2 + 57), that is

11x = 55 (divide both sides by 5)

x = 5

Substitute x = 5 into either of the 2 equations and solve for y

Substituting into (1)

2 (5) + 3y = - 2

10 + 3y = - 2 (subtract 10 from both sides)

3y = - 12 (divide both sides by 3)

y = - 4

Solution is (5, - 4)
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