In the equation x + y = 8, find the value of x if y = 3

3
5
7
11

11

Step-by-step explanation:

x+y=8     y=3

x+3=8

-3     -3

x=11

substitute y in the equation

x+3=8

then we solve for x

transpose 3 to the right 8-3=5so therefore x=5

step-by-step explanation:

assume that you have 3 different side lengths.   apply the pythagorean theorem here:   square each of the two shortest sides; call them a and b, so that their squares are a² and b².   also square the longest side, calling the result c².

now, if a² + b² = c² is true, the triangle is a right triangle; otherwise it is not a right triangle.