A necklace and earrings cost $144. Six necklaces and five pairs of earrings cost $825

Question

A necklace and earrings cost $144. Six necklaces and five pairs of earrings cost $825

in progress 0
Yến Oanh 2 weeks 2021-07-21T23:48:10+00:00 1 Answers 1 views 0

Answers ( )

    0
    2021-07-21T23:50:03+00:00

    Step-by-step explanation:

    let necklace : x

    let earrings : y

    x+y=144 -1st eqn

    6x+5y=825 -2nd eqn

    y=144-X -3rd eqn

    substitute eqn into 2nd eqn

    6x+5(144-x)= 825

    6x +720-5X =825 (expanded)

    X = 825-720

    X =105

    substitute “X=105” into 1st eqn

    (105)+y=144

    y= 144-105

    y=39

    1 necklace = 105$

    1 pair of earrings = 39$

    (to check back: substitute the value into the original eqn)

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )