In desperate need of : ( 4x - 9y =9 -x + 3y = 6 rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.

So, the problem is asking for one of the equations to be rewritten. Lets rewrite the second one. The way to create a system of equations that will cancel is to create a situation where the a or b of both equations add to 0. In this case, we can multiply the second equation by 3 to turn the 3y into 9y.

Our new system is and . We can now add these together.

Adding each part straight down, we get the equation:

We now have an equation with a single variable, which also tells us that x is equal to 27.

Extra: To find the value of y after this, we merely need to plug in the value of x to one of the equations and solve for y.

d

step-by-step explanation:

d