Question

{2x+7y=2 {y= -2x-1 Am I right?

Answer 1

Okay so we have. 2x + 7y = 2 y = - 2x - 1 Rearranging the second expression we have y + 2x = -1; So 2x + y = -1 2x + 7y = 2 2x + y = -1 Subtracting both eqns we have (2x - 2x) + (7y-y) = 2-(-1). So we have 6y =3; y = 0.5 Substituting into second eqn we have 2x + 0.5 = -1. 2x = -1-0.5=-1.5. Hence x = --0.75. So we have to check for consistency if we would confirm the expression. So Substiting values of x and y into the first eqn we have 2(-0.75) + 7(0.5) = -1.5 + 3.5 =2. And into the second eqn we have 2(-0.75) + 0.5 =-1.5 + 0.5 =-1. So, yes! You are dead right.