Question

determine whether (-1,2) is the solution of 3x-4y=9

Answer 1

Simply plug in x = -1 and y = 2 into the equation

to go from

3x-4y = 9

to

3*(-1)-4*(2) = 9


From here, evaluate and simplify the left side. If the left side comes out to be 9, then (-1,2) is a solution.

Answer 2

so the answer is yes

Answer 3

what do you get when you evaluate 3*(-1)-4*(2) ?

Answer 4

you get -11