Question

Solve using substitution: x - 4y = 4 and 2x - 3y = -3. Put answer in coordinate form.

Answer 1

substitution is reducing thenumber of variables in an equation..

one equation with 2 variables does not have a unique solution

you can figure one variable in terms of the other..

Answer 2

solve one of the two equations for x or for y

the y value is the same in the solution, so you can use what y= and replace that in the other equation

Answer 3

ill solve the first one for x

x - 4y = 4, so x = 4y + 4


with that, you can replace x in the other equation by it's value here 4y+4

2x - 3y = -3 ---> 2*(4y + 4) - 3y = -3


there you have a single variable in the equation, and can solve for a value of y,

Answer 4

Dan, for the third time, PLEASE involve your student in finding his or her answer, and do NOT just hand out yours.