Writing and Solving Equations in Two Variables — Quiz
Question 4 • Mathematics I
What is the value of x in the equation 4 x plus 8 y is equal to 40 , when y is equal to 0 point 8 ?
Answer
A
10
B
8 point 4
C
4 point 6
D
12
Explanation
Substitute y = 0.8 into 4x + 8y = 40: 4x + 8(0.8) = 40. Since 8(0.8) = 6.4, subtract to get 4x = 33.6, then divide by 4 to find x = 8.4. The correct choice is 8.4.
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