Anna V.

asked • 03/12/22

Please help! Thanks!

To solve the system of equations 3x-y=5 and 2x+3y=18, which expression could be substituted for y into the second equation?


f. 5x-3

g. 3x-5

h. 6 -2/3x

j. 18-2x

Brenda D.

tutor
Hi Anna V, you have 5 questions most of which are solved by some form of substitution. Substitution by just plugging in given values, keeping values inside the proper enclosures until the very end or rearranging an equation to solve for y. Did you try any of the substitutions?
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03/12/22

1 Expert Answer

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Robert K. answered • 03/12/22

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Simply rearrange the first equation from 3x - y = 5 to read y = 3x - 5


Then you would substitutive for y in the 2nd equation getting


2x + 3(3x - 5) = 18


Then you would solve that for x


Finally you would get y by putting the x value you just found into y = 3x - 5

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