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math help i dont get it can you explain show your work ect plz?
Write an equation for each function described. Then solve for the unknown
1.The output of a function is 7 more than 3 times the input. find the input when the output is -8
3 Answers
- Anonymous1 decade agoFavorite Answer
y=3x+7
y=-8
-8=3x+7
3x=-15
x=-5
To find the input, write down the legend like equations. Substitute y as -8 to y=3x+7. Subtract 7 by both sides and divide by 3 both sides.
- wondererLv 41 decade ago
3x + 7 = -8
-7 -7 minus seven from each side
3x = -15
/3 /3 divide each side by 3 to get x by itself
x = -5
- Anonymous1 decade ago
-8=3x+7
-8-7=3x+7-7
-15=3x
-15/3=3x/3
x=-5
(prove your work)
-5*3+7=-8
