Question

Hi! If anyone knows how to do 2 step equations please keep reading. I really need help on these math problems. please comment if you can!
1. 5x + 3 = 7
2. 5.7 + 0.3y = 6.9
3. 4.2 + 2.5a =9.2

Thank you!

Answer 1

Answer:

1.  x = 4/5

2. y = 4

3. a = 2

Step-by-step explanation:

first subtract the number without the variable from the answer. then divide the answer by whatever the number with the variable is.

1. 5x + 3 = 7

5x = 4

x = 4/5

2. 5.7 + 0.3y = 6.9

0.3y = 1.2

y = 4

3. 4.2 + 2.5a = 9.2

2.5a = 5

a =2