Question

4 x plus 8 y equals 40, when y equals 0.8?

Answer 1

X = 8.4

Explanation:

Answer 2

`\boxed{ \bold{ \huge{ \boxed{ \sf{x = 8.4}}}}}`

Explanation:

Given, y = 0.8

To find : value of x

`\sf{4x + 8y = 40}`

plug the value of y

`\longrightarrow{ \sf{4x + 8 * 0.8 = 40}}`

Multiply the numbers: 8 and 0.8

`\longrightarrow{ \sf{4x + 6.4 = 40}}`

Move 6.4 to right hand side and change it's sign

`\longrightarrow{ \sf{4x = 40 - 6.4}}`

Subtract 6.4 from 40

`\longrightarrow{ \sf{4x = 33.6}}`

Divide both sides by 4

`\longrightarrow{ \sf{ (4x)/(4) = (33.6)/(4) }}`

Calculate

`\longrightarrow{ \sf{x = 8.4}}`

Hope I helped!

Best regards ! :D