Check whether (2,-3) and (-1, 5) are solutions of the equation 4x+ y =1

Answer

(2,-3) and (-1,5) are both solutions of the equation 4x+y=1.

Missed a step, since we're being asked to check whether two points are solutions, we need to substitute each point into the equation to see if it results in a true statement.
For point (2,-3): 4(2) + (-3) = 5 which is equal to 1, therefore (2,-3) is a solution of the equation 4x + y =1.
For point (-1,5): 4(-1) + 5 = 1 which is equal to 1, therefore (-1,5) is a solution of the equation 4x + y =1.