二元一次方程组求解

-x + y =-3.5
x +3y =9.5
If (x , y ) satisfies the system of equations above, what is the value of y ?

During a month, Morgan ran r miles at 5 miles per hour and biked b miles at 10 miles per hour. She ran and biked a total of 200 miles that month, and she biked for twice as many hours as she ran. What is the total number of miles that Morgan biked during the month?

y =4x +1
4y =15x -8
The solution to the given system of equations is (x , y ). What is the value of x - y ?

7x - 5y =4
4x - 8y = 9
If (x , y ) is the solution to the system of equations above, what is the value of 3x + 3y ?

y =-3x4x + y =15The solution to the given system of equations is (x, y). What is the value of x ?

x+7=10
(x+7)²=y
Which ordered pair (x, y ), is a solution to the given system of equations?

3x =12−3x + y =−6The solution to the given system of equations is (x,y). What is the value of y ?

A company that provides whale-watching tours takes groups of 21 people at a time. The company’s revenue is 80 dollars per adult and 60 dollars per child. If the company’s revenue for one group consisting of adults and children was 1,440 dollars, how many people in the group were children?

y = 4x + 1
4y = 15x − 8
The solution to the given system of equations is (x , y). What is the value of x − y ?

5x = 15−4x + y = −2The solution to the given system of equations is (x, y). What is the value of x + y ?

y =3x
2x + y =12
The solution to the given system of equations is (x,y). What is the value of 5x ?

6x +7y =282x +2y =10The solution to the given system of equations is (x,y). What is the value of y ?