Question

Y=2x+3
X-3y=6

What would the answer be using substitution method?

Answer 1

x = y = -3

Explanation:

x - 3y = 6 => x = 3y + 6

y = 2x + 3 => y = 2(3y + 6) + 3 <=> y = 6y + 12 + 3 <=> y = 6y + 15 <=> -5y = 15 <=> y = -3

x = 3y + 6 => x = 3 x (-3) + 6 = -3

=> x = y = -3