X+y=57
y=x+15
x+x+15=57
2x=42
x=21
y=21+15
y=36
0.19880716 should be your answer
Sorry if wrong
Answer:
b = c(a - 6x )
Step-by-step explanation:
Given
6x +
= a ( subtract 6x from both sides )
= a - 6x ( multiply both sides by c to clear the fraction )
b = c(a - 6x)