exam Maths Puzzle Numerical Ability

jim is now three times as old as kathy.
Four years ago, jim was seven times as old as kathy then.
find their present ages.

PLEASE HELP ME SOLVE THIS!

and can you show work!

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exam Other Question

Fet f(x)= x squared-1 and g(x)=1-2x. Find the indicated values.

f(g(1)) and g(f(1)) 20. Write the equation of the line with x-intercept (-1, 0) and undefined slope.
A) y = -1
B) x = -1
C) y = -x
D) x = 0
no book
Thank you so very much!!