If y varies directly as x, and y us 400 when y is r and x is 4 what is the numeric constant of variation in this relation

Write the slope-intercept form of the line that passes through the point (1, 0) and is parallel to x - y = 7. t

What does the sign of the slope tell you about a line?

Ateacher wanted to buy a chair, a bookshelf, two tables and a desk. she spent $900 for all five items and the chair and the desk combined 70% of her total. if the bookshelf cost $50, how much did each of the tables cost?