System of equations

Question

• Y=x^2+6x-8
• Y=4x×7

What would be the smallest y value in the solution set of the system?

 

• -13
• -5
• 19
• 3

Answer 1

Good morning,

 

set your two equations equal to each other

 

x² + 6x + 8 = 4x + 7

 

get all terms on one side

 

x² + 2x + 1 = 0

 

factor

 

(x + 1)(x+ 1) = 0

 

x = -1

 

y = 4(-1) + 7

 

y = 3