How do I solve the following by using substitution?

Y=4x+9

10x=18 - 2y

footballs cost $22.00 each. The athletic director has $277.00 in his budget to spend on footballs. There is a $13.00 shipping fee per order. How many footballs can the athletic director order

Select all the statements that describe the following set of numbers. 3, 9, 8, 6, 3, 4, 9, 2, 5, 10, 8, 1 A) This set has three modes. B) The mean is smaller than the median. C) The mean is approximately 5.67. D) The mode is 3.

QS-→ bisects m∠PQR and m∠PQR = 124∘. Find m∠PQS and m∠RQS.

How do I do the inverse operation on 151+39=190

What was the original price if after increase by 30% it becomes $520?

ronen selects 75 random products to test their quality he found that 6 products had defects how many out of 3000 should ronen predict have defects

Is the equation true false or open (12+8) / - 10=-12/6

The population at MS 137 was 1850 students in the year 2009. In two years, by 2011, the population increased by 20percent. By 2013 the population decreased by 15percent. What was the population in 2013?

7 and 1/5 - 2 and 3/5 equal

Cameras are set up to watch an intersection and determine how many cars are let through with each green light interval. This study design would be considered: