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Use the elimination method : - Multiply the first equation by 4 and the second equation by -3 The terms in y will then become 12y and -12y so adding the 2 equations eliminates y The result will be an equation in x
- which you solve for x.
can you do this with every single substitution problem?
This is the elimination method Both the elimination and substitution method are used to solve systems of equations - the elimination method is usually the easiest one.
after multiplying should i get 17x=43?
8x + 12y = 4 9x - 12y = 30 adding:- 17x = 35
I made an error in my first post - the second equation is multiplied by 3 not -3
i have alot more questions would you mind answering
yw - i dont know ehat wrong with me this morning - i keep on doing typos!!
I have about 10 minutes so i can help with some
What is the value of the y variable in the solution to the following system of equations? 13x - 6y = 20 7x + 4y = 18
for this would you do the same and multiply line one by four and line two by 6
is the correct asnwer 1
- that would eliminate y and you need to find y
i changed my steps i multiplied by negative 7 and positive 13 and i got possitive one is that correct
- but you could do it that way - find x first - then y using substitution
ohhhh that makes sense but is the answer positive 1
lets see 91x - 42y = 140 91x + 52y = 234 add 8y = 374
not sure if thats right - dont trust myself this morning
the options were negative or positive one
oh i;ll recheck
ah - can you see my deliberate mistake ( lol 1)
since the 2 terms in x are positive you need to multiply first by 13 and the second by -7 not 7
91x - 42y = 140 -91x -52y = -234 add - 94y = -94 y = 1
hope i've helped gotta go