Given the system of equations presented here:

4x + y = 4
2x + 7y = 28

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 −1 to get −2x − 7y = −28
multiply the second equation by −4 to get −8x − 28y = −112
multiply the first equation by −7 to get −28x − 7y = −28
multiply the first equation by −2 to get −8x − 2y = −8

Can (2,3 and square root 10) be sides ona right triangle?

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

Someone answer asap for ! a ball is rolled down a ramp. the height, f(x), in meters, of the ball x seconds after it is released is modeled by the function f(x) = x²- 10x + 25 for all values of x from 0 to 5. which statement about the ball is true? a. the maximum height of the ball is 5 meters b. the height of the ball increases from 0 to 5 meters above the ground. c. the ball has traveled 5 meters when it reaches the bottom of the ramp. d. the ball has been traveling for 5 seconds when it reaches the bottom of the ramp