Solve the system of equations using substitution. 3y = –x + 2 y = –x + 9 (–1, 8) (10, –1) (20, –4) (3, 6)

Step-by-step explanation:

3y = –x + 2(1)

y = –x + 9(2)

Substituting (2) in (1)

3(-x + 9) = -x + 2

-3x + 27 = -x + 2

-3x +x = 2 - 27

-2x = -25

x = -25/-2

x = 12 1/2

Putting x in (2)

y = -x + 9

y = -25/2 + 9

y = (-25 + 18)/2

y = -7/2

y = -3 1/2

the sum of the lengths of any two sides of a triangle is greater than the length of the third side. if you take the three sides of a triangle and add them in pairs, the sum is greater than (not equal to) the third side. if that is not true, then it is not possible to construct a triangle with the given side lengths.

step-by-step explanation: