Simultaneous equations no idea somebody !

5r + 6s = 53

25r + 3s = 49

Meaning of simultaneous is to solve by elimination

Multiply the equation 2 by -2

-2( 25r + 3s = 49)

-50r – 6s = -98

Then add the two equation to eliminate s, so the resulting equation is:

-45r =-45

r = 1

substitute r = 1 to equation 1

5(1) + 6s = 53

6s = 53 – 5

6s = 48

S = 8

question 1 is 8, question 2 is 9, question 3 is 24

step-by-step explanation:

now, the numbers they give you at the top are the key. from there, you just have to plug and chug! let's try 1, 2, and 3!

key: a=3, b=5, c=6

1. a+5

remember, a=3, so we plug that in to get 3+5=8

2. 15-c

c=6, so we plug that in to get 15-6=9

3. 4b

b=6, so we plug it in to get 4*6=24

time to try the rest on your own! if you put the answers below in a comment, i'll check them for you!