Question

please answer as soon as possible

Answer 1

For infinite solutions, the formula is:
$\frac{a1}{a2} = \frac{b1}{b2} = \frac{c1}{c2}$
where a1, a2, b1, b2, are coefficients of x and y and c1 and c2 s are constants.

Now, here the formula will be like this:

$\frac{5}{a + b } = \frac{8}{a - b} = \frac{7}{2a + b + 1}$

So the two equations will be:
$\frac{5}{a + b } = \frac{8}{a - b}$
and
$\frac{8}{a - b} = \frac{7}{2a + b + 1}$
Solve these equations to find the values of a and b

Hope this helps :)