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wariber [46]
3 years ago
10

How do you solve, not just the answer PLEASE -2r-4=3r+16

Mathematics
2 answers:
geniusboy [140]3 years ago
8 0

-2r-4=3r+16\ \ \ |+4\\\\-2r=3r+20\ \ \ |-3r\\\\-5r=20\ \ \ \ |:(-5)\\\\r=-4

Answer: r = -4

Nonamiya [84]3 years ago
6 0

Isolate the variable "r". Add 2r to both sides, while subtracting 16 from both sides. You will be left with -20=5r. Then you need to divide 5 from both sides. Your answer will be -4=r.

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Step-by-step explanation: Please refer to the attached diagram

The diagram in the question shows two triangles placed on each other and for convenience sake has been labelled ABDCE. Triangle ABC is a right angled triangle, and so is triangle ADE. From the marks on the lines, we can infer that line AD is equal in measurement to line DB. Also line AE is equal in measurement to line EC.

Therefore we can see the similarity in both triangles, if AD and AE equals DB and EC, then it follows that DE equals BC.

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Read 2 more answers
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