# math

if xy=7 and x-y=5, what are the values of x and y? please help!!!

1. 👍 0
2. 👎 0
3. 👁 91
asked by Alyssa
1. x * y = 7
x - y = 5
One method:

express one variable in terms of the other variable and then solve the single variable expression.

If x - y = 5
then y = x - 5
substituting back into the first equation:
x * (x - 5)=7
Solve for x, then substitue the x value into either equation to solve for y.
You will probably need to use the quadratic formula to solve it.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Algebra

Complete the table for each function. 1. f(x) = √x The x values are 0, 1,4 and 9. The corresponding y values that I got are 0, 1, 2 and 3. 2. g(x) = -1/4√ x The x values are 0, 1, 4, and 9. The corresponding y values that I

asked by Student on March 11, 2014
2. ### Chemistry

How many possible values for pair l and m_{l} are there when n_1 = 3? How many possible values for pair l and m_{l} are there when n_2 = 5? Express your answer as an integer. I understand the following solution: "we know that for

asked by Bobby on November 9, 2010
3. ### Pre-Algebra

Complete the sentence below. Scatter plots are used to look for a pattern of association, or trend, between ____________ A) one set of values. B) two sets of values. C) three sets of values. D) four sets of values. My Answer: B)

asked by Wendy on March 25, 2013
4. ### Maths

The question is "Show that z-2 is a factor of P(z)= z^3+mz^2+(3m-2)z-10m-4 for all values of m. For what values of m is (z-2)^2 a factor of P(z)?" I've proven the first part, using synthetic division, for all values of m. But the

asked by TP on April 13, 2009
5. ### Pre-Algebra

Scatter plots are used to look for a pattern of association, or trend, between one set of values two sets of values three sets of values four sets of values My answer: two sets of values

asked by Emily on March 10, 2014
6. ### domain

How do you find the domain of log(x^2-4)? and how about this one? e^(3x+4)? Please help me! Well kristie, you might recognize log(x^2-4) = log((x-2)(x+2)) and then use a property of logs to see it as a sum, i.e.,

asked by kristie on July 17, 2006
7. ### Math ~ Check 1 Answer ~

Complete the sentence below. Scatter plots are used to look for a pattern of association, or trend, between one set of values. two sets of values******* three sets of values. four sets of values

asked by Cindy on March 27, 2014
8. ### algebra.math

i need serious help, I'm trying to plot table of values for sketching graph (parabola)for y=x^2-5x+3 xy values are 0,3 1,-1 2.5,-3.25 3,-3 4,-1 5,3 6,9 are these values correct, I'm having problems graphing.

asked by kate on November 14, 2007
9. ### Science

What are the theoretical molar ratio values for Ag:Cu and Ag:AgNO3? Compare these values to the values you got in your experiment and compute a percent error for your work.

asked by Christine on May 27, 2011
10. ### Science

Study the data table below. A three-column table presenting the 'Melting Point and Boiling Point for Common Substances.' The column headers are 'Substance,' 'Melting point (°C),' and 'Boiling point (°C).' For substance aluminum,

asked by Heather Pleasee Helppp on October 31, 2011
11. ### Algebra

Find the values of the polynomial for the given values of the variable. -x2-5x-6 x=-3 x=-2 I got 0 for the first one and 0 for the second. Am I figuring them wrong? (and that is an x squared, not 2x) -(-3)^2 -5(-3)-6 -(9)+15-6=0

asked by Serra on August 20, 2007

More Similar Questions