Question

a=8 and b=4, find the values of

a/b and ab

quickly answer​

Answer 1

$a = 8 \\ b = 4$

$\frac{a}{b} = \frac{8}{4} = 2$

$ab = 8 \times 4 = 32$

Answer 2

Answer:

a+b=-8 and a-b=4, what are a and b?

Ellis Cave

Answered 2 years ago

Using algebra:

a+b=_8 (1) (underbar is a negative — _8 = -8

a-b=4 (2)

b= _8-a — (3) Solve (1) for b

a - (_8-a)=4 — (4) Plug (3) ‘b’ into (2)

a + 8 + a=4 — (5) Remove parenthesis in (4)

2a + 8=4 — (6) Consolidate (5)

2a = 4 - 8 = _4 — (7) Subtract 8 from both sides.

a=_4/2 =_2 — So a =-2 (8) Divide both sides by 2

b=_8 -_2 — (9) Plug a = _2 into (1)

b = _6 — b = _6 (10) Solve for b

The answer is a = -2, and b = -6

Check using J programming language:

b=._6

a=._2

a+b

_8

a-b

4