Solve the following System of Equations using Substitution:
x+3y=1
−3x−3y=−15

Which of the following are accepted without proof in a logical system? check all that apply.

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

Consider this equation. |y + 6| = 2 what can be concluded of the equation? check all that apply. there will be one solution. there will be two solutions. the solution to –(y + 6) = 2 will be also be a solution to the given absolute value equation. the solution(s) will be the number(s) on the number line 2 units away from –6. the value of y must be positive since the variable is inside absolute value signs.