Which graph can be used to find the solution(s) to x2 – 1 = 3?

Find a number such that if you add 8 and divide the result by 4 you will get the same answer as if you subtracted 3 from the original number and divided by 2

Iq scores for adults age 20 to 34 years are normally distributed according to n(120, 20). in what range does the middle 68% of people in this group score on the test?

X+ y = 5 ; x - y =3 solve using linear combination