Answer:
x = -1 , y = 2 thus the answer is B
Explanation:
Solve the following system:
{2 y - 5 x = 9 | (equation 1)
{3 x + 5 y = 7 | (equation 2)
Add 3/5 × (equation 1) to equation 2:
{-(5 x) + 2 y = 9 | (equation 1)
{0 x+(31 y)/5 = 62/5 | (equation 2)
Multiply equation 2 by 5/31:
{-(5 x) + 2 y = 9 | (equation 1)
{0 x+y = 2 | (equation 2)
Subtract 2 × (equation 2) from equation 1:
{-(5 x)+0 y = 5 | (equation 1)
{0 x+y = 2 | (equation 2)
Divide equation 1 by -5:
{x+0 y = -1 | (equation 1)
{0 x+y = 2 | (equation 2)
Collect results:
Answer: {x = -1 , y = 2