Question

4x+5y:4x-5y=19:7 find x:y

Answer 1

4x+5y=19 4x-5y=7 ________ 8x-0=26 8x=26 x=13/4  4×13/4+5y=19 13+5y=19 5y=6 y=6/5

Answer 2

Answer:

$\large\bold\green{☑Verified Answer:-}$

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$(4x + 5y)(4x - 5y) = (4 {x}^{2} ) -( 5 {y}^{2} ) \\ = 16 {x}^{2} - 25 {y}^{2}$

where,

$a = 4x \: and \: \: b = 5y \\ identity = (a + b)(a - b) = {a}^{2} - {b}^{2}$