Question 1065160
Let A represent Arlene
Let K represent Karen
What do we know from the problem?
A + K = 1210
K = A + 170
Substitute the value from the second equation into the first.
A + K = 1210
A + (A+170) = 1210
2A + 170 = 1210
2A = 1040
A = 520
If A is 520, then K is 1210-520 or 690.  690 is 170 more than 520.
Karen makes $690/week.
Arlene makes $520/week.