Brainliest to correct answer. Find the value for the side marked below.
Round your answer to the nearest tenth.
21
у
80°
y = [?]

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0