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liq [111]
3 years ago
6

IN DESPERATE NEED OF HELP :(

Mathematics
1 answer:
Eddi Din [679]3 years ago
8 0

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.


3(-x + 3y) = (6)3

-3x + 9y = 18


Our new system is 4x - 9y =9 and -3x + 9y = 18. We can now add these together.


4x - 9y = 9

-3x + 9y = 18


Adding each part straight down, we get the equation:

x + 0 = 27


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.


-27 + 3y = 6

3y = 33

y = 11

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