數學問題......請回答3

Linear Equations in Two Unkowns

1.The prices of one-day tickets of Pan Lloyds Wonderland fos an adult and a child are $350 and $250 respectively . If a group of 7 visitors needs to pay $2150 for their tickets, how many adults and children are there in ther group?

{x-y=3
2.Consider the simyltabeous equations{z-y=5
{x+z=6
(A) Rewrite the simultaneous equations by expressing y in terms of x and z.

(B) Try to solve the simulaneous equations. Can you find the exact value of the
unkowns ? Briefly explain your idea.