For the following system, if you isolated x in the first equation to use the substitution method, what expression would you substitute into the second equation? -x - 2y = -4 3x + y = 12
a. -2y - 4
b. 2y - 4
c. 2y + 4
d. -2y + 4

If the value of x increases by 5, how does the value of m(x + 3) change? a) it increases by 5m. b) it increases by 8m. c) it decreases by 5m. d) it decreases by 8m.

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

Given: lines a and b are parallel and line c is a transversal. prove: 2 is supplementary to 8 what is the missing reason in the proof? statement reason 1. a || b, is a transv 1. given 2. ∠6 ≅ ∠2 2. ? 3. m∠6 = m∠2 3. def. of congruent 4. ∠6 is supp. to ∠8 4. def. of linear pair 5. ∠2 is supp. to ∠8 5. congruent supplements theorem corresponding angles theorem alternate interior angles theorem vertical angles theorem alternate exterior angles theorem