What is the value of a if the point ( a, -1) is on the line 4x -3y = 15?
a = 3
(a, -1) is (x, y)
Plug in the value of y into the given equation to solve for a (x):
4x – 3(-1) = 15
4x + 3 = 15
4x = 12
x = 3
(x, y) is (a, -1) so (a, -1) = (3, -1)
We are given a point and an equation. To see what “a” is, we can plug in the coordinate into the equation and solve for x.
4a+3=15 [subtract both sides by 3]
4a=12 [divide both sides by 4]
Now, we know that a=3.
You must be logged in to post a comment.