08-02-2015
Mathematics

contestada

4x+15y=13
3x+5y=16
solving systems by elimination

Respuesta :

08-02-2015

4x+15y=13 (1)
3x+5y=16 (2)
(2) * 3 --> 9x+15y=48 becomes (3)
(3) - (1)
5x=35
x=7
sub x =7 into (1)
4(7)+15y=13
28+15y=13
-28 -28
15y= -15
y= -15/15
y= -1

therefore x=7 and y= -1

Answer Link

Otras preguntas

Dani wants to make a punch using orange juice. The recipe calls for 11 cups of orange juice. How many pints is that? (1 cup = 0.5 pints)

ASAP!!! A school administrator wants to know what proportion of teachers in their state have a Master's degree. The administrator takes an SRS of 100 teachers f

5. (06.01 MC) Part 1. A slightly inflated balloon is Part 1. A slightly inflated balloon is placed about eight centimeters above a burning candle, Explain the c

1. A motorboat travels 196 meters in 20 seconds. What is the motorboat's unit rate of speed? Step1. Write equivalent ratios. The boat's rate of speed is 196m/20

What is the value of t? 37°

c) The phone case you want to buy is marked down 30%, and you have a 25% off coupon. You pay $42.00. Can this equation be used to find the original price of the

Please help I’m stuck on this

Find the points at which the graph of the equation has a vertical or horizontal tangent line. 81x^2 + 49y^2 + 1134x − 882y + 3969 = 0

penny has a group of friends who are really smart with computers. They claim they have a fool proof way to access questions to the upcoming SAT they are going t

The force of impact is