AlgebraEasySystem where the two variables are equal
Algebra practice question
The solution of the system y = x and x + y = 10 is the point (a, a). What is the value of a?
Answer: 5
With y = x, the second equation is 2x = 10, so x = 5 and the point is (5, 5).
Common wrong answers
- If you answered 0
- 0 satisfies y = x but not x + y = 10.
- If you answered 10
- 10 is the sum, not each coordinate.
- If you answered 20
- 20 doubles the sum.
More Algebra questions
- Easy
If 3x + 7 = 22, what is the value of x? - Easy
If x/4 = 9, what is the value of x? - Easy
The function f is defined by f(x) = 6x − 5. What is the value of f(3)? - Easy
The perimeter P of a rectangle with length l and width w is given by P = 2l + 2w. Which of the following expre… - Easy
Which equation defines the function f? - Easy
In the xy-plane, the graph of the equation y = 4x − 12 crosses the x-axis at the point (a, 0). What is the val…
Not affiliated with the College Board. SAT is a trademark of the College Board.