Question

Write the missing numbers so that 2a + 5b = 30

2a + 5b = 30 when a=0 and b= 6

2a + 5b = 30 when a=5 and b= _____

2a + 5b =30 when a=15 and b= _____

I really have no clue on how to do this and I need the answer really quickly!

Answer 1

First blank:
B= 4

Second blank:
B= 0

Answer 2

on 2. 2 times 5 equals 10 so be equals 4 because 5 times 4 equals 20 and 20 plus 10 equals 30 and on 3 2 times 15 equals 30 so be equals 0

2-B equals 4
3-B equals 0