Joel = j, Mark = m, Sandra = s
j + m + s = 120
m = 3j
j = 1/2 s --> s = 2j
plug in (substitute) each letter to make it in terms of only j: j + m + s = 120
j + 3j + 2j = 120
6j = 120
6j/6 = 120/6
j = 20
now plug in for the j & s equation:
s = 2j = 2(20) = 40
Therefore Sandra has 40 coins!
Answer:
It's true
Step-by-step explanation:
f(x) and g(x) are another name to use instead of y
A function is an equation which, for every x, has only one response for y. A function assigns each input of a given form to exactly one output.
Answer:
Step-by-step explanation:
The equation of the line is y = 3x - 4, so the inequality is y <= 3x - 4.
Answer:
Yes they are proportional because he is selling cars at the same rate
Step-by-step explanation:
