Helppp help needed pls

What is the solution to the system of the equations? x = y - 3 x + 3y = 13

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

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?