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Year 9 Maths - linear equations please help

Solve the pair of simultaneous equations:
3x-y=7
y=x+5
using the substitution method to find the values of x and y.

Respuesta :

Answer:

x=1 & y=6 or (1,6)

Step-by-step explanation:

3x-x+5=7   Substitute the 2nd equation in for y  

2x+5=7      Do 3x-x to get 2x

2x=2          Subtract 5 from both sides

x=1              Divide 2 from both sides

y=1+5          Insert 1 as x

y=6             Add 1+5 to solve for y

Hope this helped!  

smileandbehappy
X=3, Y=9
X+Y=12
Y=X+6

X+X+6=12
2X=6
X=3

Y=3+6=9

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