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How do you do the addition elimination method on this 4s minus 5t equals 18 and 6s plus 10t equals -8?
Rwalker50
4s-5t = 18
6s+10t = -8
Multiply all the terms in the top equation by 2:
8s-10t = 36
6s+10t = -8
Adding both equations leaves you with:
14s = 28
Divide both sides of the equation by 14 to find the value of s:
s = 2
Substitute the value of s into the original equations to find the value of t:
t = -2
Remember when substituting that a - times a - is equal to a + therfore: -5t = 10
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∙ 14y ago
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