Please help! 1 quick question! xoxo

Plot the intercepts to graph the equation

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?

Peter measures the angles in a triangle. he finds that the angles are 95, 10 and 75. is he correct? explain your answer