Question

y varies jointly as x and z. If y = 5 when x = 3 and z = 4, find y when x = 6 and z = 8.

Answer 1

GIVEN  Y VARIES AS X AND Z .

Y = 5 WHEN X = 3 AND Z = 4.

Y = ? WHEN X = 6 AND Z = 8

WE CAN OBSERVE THAT X AND Z ARE DOUBLED.

SO, THE SAME THING HAPPENS TO Y FROM THE GIVEN CONDITION.

THUS, Y = 10

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