Question

Solve the system, using substitution. One point for correct steps, one point for correct ordered pair, (a,b).
a + b = 4 and 2a + 3b = 11

Answer 1

a + b = 4 ---> a = 4 - b
2a + 3b = 11 ----> a = (11 - 3b)/2

a = a
2(4-b) = 11 - 3b
8 - 2b = 11 - 3b
3b - 2b = 11 - 8
b = 3
a = 1

(a,b) = (1,3)