Question

1) 1 + 5r – 4r = 7
A) 12
B) {-8
C) 6.
D) 8

Answer 1

`\boxed{ \bold{ \huge{ \boxed{ \sf{r = 6}}}}}`

Option C is the correct option.

Explanation:

`\sf{1 + 5r - 4r = 7}`

Collect like terms

`\longrightarrow{ \sf{1 + r = 7}}`

Move 1 to right hand side and change it's sign

`\longrightarrow{ \sf{r = 7 - 1}}`

Subtract 1 from 7

`\longrightarrow{ \sf{r = 6}}`

Hope I helped!

Best regards! :D