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.

It seems like you are solving a system of equations by elimination. One way to solve eliminate a variable would be to multiply the last equation by 3:

4x - 9y = 9 > 4x - 9y = 9

3(-x + 3y = 6) > -3x + 9y = 18

x = 27

The -9y and 9y cancel out if you multiply the bottom equation by 3.

b

step-by-step explanation:

b

42.4

step-by-step explanation:

convert to decimal