Đề thi Olympic Tiếng Anh lớp 9 vòng 19

The roots of the equation 2x² – x = 4 are

Which graph represents the inverse of f(x) = {(0,1),(1,4),(2,3)}?

If point C(-3, 8) is the midpoint of a line segment with endpoints A(-9, -2) and B, what are the coordinates of point B?

What is the y-intercept of a line that passes through (–5, 6) and has an x-intercept of 3?

In the equation y = 4x + 8, y is a function of x. If the value of x is decreased by 3, how will the value of y change?

Solve |3x + 7| = 11.

Using the mapping above, which represent functions?

Graciela wanted to buy a new winter coat. The store was offering a 30% discount plus an extra $6 discount for paying cash. Graciela bought a coat for cash and paid $80.80. Which of the following equations could be used to find the original price of the coat, x?

From the chart above, what is the value of y when x = 12?

How many different values of k exist so x2 + kx – 15 is factorable using integers?