An isosceles triangle has two sides of equal length. An equilateral triangle has three sides of equal length. In a right triangle, two sides meet at a right angle.

To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the < sign and the answer on the other.

4x - 2 < \( \frac{x}{-7} \)
-7 x (4x - 2) < x
(-7 x 4x) + (-7 x -2) < x
-28x + 14 < x
-28x + 14 - x < 0
-28x - x < -14
-29x < -14
x < \( \frac{-14}{-29} \)
x < \(\frac{14}{29}\)

A rhombus is a parallelogram with four equal-length sides. A square is a rectangle with four equal-length sides.

To factor a quadratic expression, apply the FOIL method (First, Outside, Inside, Last) in reverse. First, find the two Last terms that will multiply to produce 9 as well and sum (Inside, Outside) to equal -10. For this problem, those two numbers are -9 and -1. Then, plug these into a set of binomials using the square root of the First variable (y²):

y² - 10y + 9
y² + (-9 - 1)y + (-9 x -1)
(y - 9)(y - 1)

When solving an equation with two variables, replace the variables with the values given and then solve the now variable-free equation. (Remember order of operations, PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.)