exam Maths Puzzle Numerical Ability

m=y2-y1/x2-x1
How do I know how to know the ecuation for x1?

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exam Other Question

THREE-FOURTHS OF THE GYMNASTICS CLASS ARE GIRLS. AFTER TWELVE BOYS JOIN THE CLASS, THE NUMBER OF BOYS AND GIRLS ARE THE SAME. HOW MANY STUDENTS ARE IN THE CLASS NOW? HOW MANY STUDENTS ARE IN THE CLASS AFTER THE 12 BOYS JOIN? Consider f(x)=x^2; s(x) is f(x) shifted which way and how far, if
s(x) = (x+2)^2 -3?

a. To the left 4 units
b. to the right 2 units
c. to the left 2 units