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Jacey Lester
29 June, 18:51
Y=6x 2x+3y=-20. (Solving by substitution)
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Rowan Hunter
29 June, 19:52
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This is straight forward:
y = 6x ... (i)
2x + 3y = - 20 ... (ii)
We simply substitute (i) into (ii)
2x + 3 (6x) = - 20
2x + 18x = - 20
20x = - 20
x = - 20/20
x = - 1.
Recall y = 6x
y = 6 (-1) = - 6.
x = - 1, y = - 6.
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Kason Blevins
29 June, 22:42
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Y=6x, 2x+3y=-20
Substitution means just plugging in another equation equal to a single variable in order to solve for the other variable, and then the first. In this case, the equation being plugged in is y=6x, so 6x will be put in place of y in the equation 2x+3y=-20.
2x+3 (6x) = - 20
2x+18x=-20
20x=-20
x=-1
And then x=-1 can be plugged into the original equation to find y. (And, if you wish, into the y = equation to check it.)
2 (-1) + 3y=-20
-2+3y=-20
3y=-20+2
3y=-18
y=-6
And to check it, we plug the two into the original y = equation.
y=6x
-6=6 (-1)
-6=-6
They are equal, so both check out.
x=-1, y=-6
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