+0

# simultaneous equations

+1
296
1
+32

simultaneous equations

5x+2y=-2

3x-5y=17.4

yahya  May 13, 2017

### Best Answer

#1
+7266
+4

For this we can use the elimination method.

5x + 2y = -2

3x – 5y = 17.4

Multiply the top equation through by $$\frac52$$ .

$$\frac{25}{2}$$ – 5y = -2

Now line this up with the second equation and add straight down.

$$\frac{25}{2}$$x    +    5y = -5

+   3x      –    5y = 17.4

15.5x +    0y = 12.4

15.5x = 12.4

x = 12.4/15.5

x = 0.8

Now just use this value for x in either equation to find y.

5(0.8) + 2y = -2

4 + 2y = -2

2y = -6

y = -3

hectictar  May 13, 2017
#1
+7266
+4
Best Answer

For this we can use the elimination method.

5x + 2y = -2

3x – 5y = 17.4

Multiply the top equation through by $$\frac52$$ .

$$\frac{25}{2}$$ – 5y = -2

Now line this up with the second equation and add straight down.

$$\frac{25}{2}$$x    +    5y = -5

+   3x      –    5y = 17.4

15.5x +    0y = 12.4

15.5x = 12.4

x = 12.4/15.5

x = 0.8

Now just use this value for x in either equation to find y.

5(0.8) + 2y = -2

4 + 2y = -2

2y = -6

y = -3

hectictar  May 13, 2017

### New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.