Answer:
b=9,a=12
Step-by-step explanation:
I solved by substitution:
b = 3/4a ---> plug this into the other equation
a + b = 21 is now a + 3/4a = 21
Reduce: 7/4a = 21
a = 12
Now solve for b:
b=3/4a is now b=3/4(12)
b=9
5(2a-6) = 10a-30 you would just multiply 2a and -6 by 5
Answer:
Step-by-step explanation:
(1 + 3)/(3-1) = 4/2 = 2
y - 1 = 2(x - 3)
y - 1 = 2x - 6
y = 2x - 5