Use cross products to identify the equation needed to solve this proportion: 5 x = 2 9 5x = 18 2x = 45 9x = 10 2x = 14

What is the missing step in this proof ?

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

[15 points]find the least common multiple of the expressions: 1. 3x^2, 6x - 18 2. 5x, 5x(x +2) 3. x^2 - 9, x + 3 4. x^2 - 3x - 10, x + 2 explain if possible