+129852 Here's 1
We have the following two functions :
y = 12x + 50
y = 20x
Here's the graphs : https://www.desmos.com/calculator/9quniellja
The break-even point is at ≈ 7 cars
This means that if he sells 7 cars or more, he makes a profit
+129852 The idea in the first two is to multiply through by the common denominator of both fractions
2. (1/2)x + (3/2)y = 4 multiply through by 2 ⇒ 1x + 3y = 8
(2/3)x - (1/3)y = 7 multiply through by 3 ⇒ 2x - 1y = 21
3. (-1/3)x + (1/2)y = 5 multiply through by 6 ⇒ -2x + 3y = 30
(3/4)x - (1/4)y = 10 multiply through by 4 ⇒ 3x - 1y = 40
4. .5x + 1.2 y = 2 multiply through by 10 ⇒ 5x + 12y = 20
3.3x - .7y = 3 multiply through by 10 ⇒ 33x - 7y = 30
