Determine if the given ordered pairs are solution of x+ 4y = 7.

2.) (2,-1)

Begin by substituting the points with x and y in the equation.

Here’s what we know:
(x, y) —> (2, -1)

Equation: 2 + 4(-1) = 7

We must multiply first, according to the order of operations.

4 x -1 = -4

Now, we have 2 + (-4) = 7, which is the same as 2 - 4 = 7.

2 - 4 = -2.

We now have -2 = 7.

This is incorrect, so the given ordered pairs are NOT a solution of x + 4y = 7.