Here we need two numbers whose product is -70 and whose sum is -9 (don't forget those negative signs). To have a product of -70, exactly one of the numbers must be negative. We don't care which one, as long as somebody volunteers.
Numbers that have a product of 70:
Since -14 + 5 = -9, we can stop looking at factors of 70 now. Good, because our eyes were starting to zone out a bit.