Question

5^2+ 2y= -11 & 2x+2y=5 ( solve using substution method) ​

Answer 1

Answer:

5^2 + 2y = -11

So, 2y = -11 - 25 = -36

so, y = -18

2x + 2y = 5

Substitute the value of y in this equation

2x + (-36) = 5

transposing -36 to the other side

So, 2x = 5+36

2x = 41

x = 20.5

I hope it is correct and helps you

Answer 2

Answer:

On putting x=2y+5 in second equation, we get

y=(4y+7)(2y+14)⇒8y 2

+70y+98=y⇒8y 2

+69y+98=0

Discriminant D=69 2 −4(8)(98)=1625>0

Hence, the equation has 2 real roots.

Therefore, there are 2 ordered pair.

Option C is correct.