Question

5a - 2b = 7 and 5a +2b =14 in elimination method​

Answer 1

5a - 2b = 7
5a + 2b = 14
———————- -
-4b = -7
b= 7/4

Answer 2

a = 2.1

b = 1.75

Explanation:

5a - 2b = 7

5a + 2b = 14

Combine the equation, we get

10a = 21

a = 2.1

Now put 2.1 in for a and solve for b

5(2.1) - 2b = 7

10.5 - 2b = 7

-2b = -3.5

b = 1.75

Let's Check

5(2.1) - 2(1.75) = 7

10.5 - 3.5 = 7

7 = 7

So, a = 2.1 and b = 1.75 is the correct answer.