Use the substitution method to solve the system of equations. choose the correct ordered pair. x + 2y = 12 –x = –y – 6
a. (9, 3)
b. (7, 1)
c. (6, 0)
d. (8, 2)

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

Tomas is making trail mix using granola and walnuts. he can spend a total of $12 on the ingredients. he buys 3 pounds of granola that costs $2.00 per pound. the walnuts cost $6 per pound. he uses the equation to represent the total cost, where x represents the number of pounds of granola and y represents the number of pounds of walnuts. he solves the equation for y, the number of pounds of walnuts he can buy. answer- b tomas added 6 to both sides of the equation instead of subtracting 6. just took the test

Write an inequality and solve each problem. for exercises 11 and 12, interpret the solution.