exam Maths Puzzle Numerical Ability

determine if the following is parallel, perpindicular, or neither
y=x+3
y=-x+3

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exam Other Question

If the quotient of three times a number and five is increased by four, the result is 34. Find the number.
This problem was on a work sheet, but I believe it is in chapter 1
if a arithmetic student needs an average of 70 or more to receive credit for the course. She scored 82, 64, and 98 on the first three exams. Write an inequality representing the score she must get on the last test to receive credit for the course.