HRS - Ask. Learn. Share Knowledge. Logo

In Mathematics / High School | 2014-10-28

What is the value of \( x \) in the equation \( 4x + 8y = 40 \), when \( y = 0.8 \)?

A. 4.6
B. 8.4
C. 10
D. 12

Asked by Anonymous

Answer (3)

**y x **
0.8 8.4 4.6 0.8 8.4 -6.8 10 -10
12 -14

Answered by ollieboyne | 2024-06-10

4x + 8y = 40
When y = 0,8 :
4x + 8*0,8 = 40 4x + 6,4 = 40 4x = 40 - 6,4 4x = 33,6 x = 33,6/4 x = 8,4
Answer : 8,4

Answered by eah | 2024-06-25

The value of x in the equation 4 x + 8 y = 40 when y = 0.8 is 8.4 . This is found by substituting y into the equation and solving for x . The correct answer is option B.
;

Answered by eah | 2024-08-08

Related Questions in Mathematics

[Done] Select the correct answer. Which equation is equivalent to the given equation? [tex]$x^2-6 x=8$[/tex] A. [tex]$(x-6)^2=44$[/tex] B. [tex]$(x-3)^2=17$[/tex] C. [tex]$(x-6)^2=20$[/tex] D. [tex]$(x-3)^2=14$[/tex]

[Done] Which phrase best describes the translation from the graph [tex]y=6 x^2[/tex] to the graph of [tex]y=6(x+1)^2[/tex]? A. 6 units left B. 6 units right C. 1 unit left D. 1 unit right

[Done] What expression is equivalent to [tex]$\left(5 z^2+3 z+2\right)^2$[/tex] ? A. [tex]$5 z^4+3 z^2+4$[/tex] B. [tex]$5 z^4+9 z^2+4$[/tex] C. [tex]$25 z^4+30 z^3+19 z^2+12 z+4$[/tex] D. [tex]$25 z^4+30 z^3+29 z^2+12 z+4$[/tex]

[Done] The graph of [tex]y=\frac{5}{4} x+1[/tex] is shown below. The coordinate ([tex]0, y[/tex]) is a solution of the equation. Given the [tex]x[/tex]-value of 0, what is the value of the [tex]y[/tex]-coordinate for the coordinate ([tex]0, y[/tex])? [tex]y=[/tex] [blank]

[Done] If [tex]f(-2)=0[/tex], what are all the factors of the function [tex]f(x)=x^3-2 x^2-68 x-120[/tex]? Use the Remainder Theorem. A. [tex](x+2)(x+60)[/tex] B. [tex](x-2)(x-60)[/tex] C. [tex](x-10)(x+2)(x+6)[/tex] D. [tex](x+10)(x-2)(x-6)[/tex]