Tim and Jim sell the same products. However, Tim sells his products at the lowest price in the market. Which strategy is Tim using?

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

3x + 4y = 5 x- 3y = -7 solve by substitution

One number is 4 less than 3 times a second number. if 3 more than two times the first number is decreased by 2 times the second number, the result is 11. use the substitution method. what is the first number?