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2 votes
What is the solution to the system of equations below? y=-2x-6 and 2y=4x-12


User Dcrearer
by
6.3k points

2 Answers

4 votes

Answer:

{x = 0 , y = -6

Explanation:

Solve the following system:

{y = -2 x - 6 | (equation 1)

{2 y = 4 x - 12 | (equation 2)

Express the system in standard form:

{2 x + y = -6 | (equation 1)

{-(4 x) + 2 y = -12 | (equation 2)

Swap equation 1 with equation 2:

{-(4 x) + 2 y = -12 | (equation 1)

{2 x + y = -6 | (equation 2)

Add 1/2 × (equation 1) to equation 2:

{-(4 x) + 2 y = -12 | (equation 1)

{0 x+2 y = -12 | (equation 2)

Divide equation 1 by 2:

{-(2 x) + y = -6 | (equation 1)

{0 x+2 y = -12 | (equation 2)

Divide equation 2 by 2:

{-(2 x) + y = -6 | (equation 1)

{0 x+y = -6 | (equation 2)

Subtract equation 2 from equation 1:

{-(2 x)+0 y = 0 | (equation 1)

{0 x+y = -6 | (equation 2)

Divide equation 1 by -2:

{x+0 y = 0 | (equation 1)

{0 x+y = -6 | (equation 2)

Collect results:

Answer: {x = 0 , y = -6

User Dreyescat
by
5.6k points
5 votes

Answer: infinitely many solutions

Step-by-step explanation: ^^

User Henrik Carlqvist
by
6.7k points