What is the slope to the equation (2,1) (-1,-2)

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

Given the system of equations presented here: 2x + 4y = 14 4x + y = 20 which of the following actions creates an equivalent system such that, when combined with the other equation, one of the variables is eliminated? multiply the second equation by â’4 to get â’16x â’ 4y = â’80 multiply the second equation by â’1 to get â’4x â’ y = â’20 multiply the first equation by 2 to get 4x + 8y = 28 multiply the first equation by â’1 to get â’2x â’ 4y = â’14

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.