What is the perimeter of this triangle?
(will give brainliest if correct)

How do you use the additive inverse to evaluate an expression that uses subtraction in a full sentence

Use sigma notation to represent the following series for 9 terms.

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?