Acute triangle with side lengths x, x+4, and 20

The triangles are similar. what is the value of x? x=

Complete the solution of the equation. find the value of y when x equals -5. -4x - 8y = -52

Three students each examine the system of linear equations shown. 8x + 4y = 16 8x + 2y = 8 caleb says there is exactly one solution. jeremy says there is no solution. kim says there are infinitely many solutions. which student is correct? provide mathematical reasoning to support your answer. answer in complete sentences. : d