Question

Solve the simultaneous equations
-x + 5y = -7
x + y = – 5
x = 1
y= 0

Answer 1

y= -2, x= -3

Step-by-step explanation:

Firstly, substitute the x and y values:

-x + 5(0)= -7

x+ 0 = -5

second thing to check: DSA - different signs addition (positive x and -x)

-x+5y=-7 take away x+y=-5

6y= -12

y= -2

To find x: -x + 5(-2)= -7

-x= -7 + 10

x= -3

Answer 2

y= -5-x

-x + 5(-5-x) = -7

-x -25-5x =-7

-x-5x = 25 -7

-6x= 18

x = -3

-3 +y = -5

y= -5 +3

=-2

-(-3) + 5(-2)

3 - 10 = -7