Volume round to the nearest tenth

Solve the system of equations. y= 2x y= x^2 - 15

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

The value of x in this system of equations is 1. 3x + y = 9 y = –4x + 10 substitute the value of y in the first equation: combine like terms: apply the subtraction property of equality: apply the division property of equality: 3x + (–4x + 10) = 9 –x + 10 = 9 –x = –1 x = 1 what is the value of y?