Test 2 Section 4 #7

Could you please explain Test 2 Calculator Active #25

Hello, I know you’ve already solved practise test 2, section 4 question 29 (by either using your graphic calculator or by looking at the equation of a parabola) but how would you use backsolving? Lets say I try in option C and im getting y as 3 (which means my equations do NOT have 2 real solutions), how do I know whether to try out option B or D next?

Thank you so much!

Test 2 calculator section #19. I guessed and got it right but how do you do it?

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