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marshall27 [118]
3 years ago
9

Use the substitution method to solve these simultaneous equations.

Mathematics
1 answer:
Amanda [17]3 years ago
4 0

Answer:

Step-by-step explanation:

a) 3x+2(41-5x)=33            as y=41-5x is given

3x+82-10x=33

-7x+82=33

-7x=33-82

-7x=-49        cut the negative signs as its LHS and RHS

<u>x=49/7=7</u>

b)-5x+3(3x-3)=3   as y=3x-3 is given

-5x+9x-9=3

4x-9=3

4x=3+9

<u>x=12/4=3</u>

<u>c</u>)4x+11-5x=9

-x+11=9

-x=9-11

-x=-2         cut the negative signs as its LHS and RHS

<u>x=2</u>

d) 5y+ -5-2y=-11      as x=-5-2y is given

3y+-5=-11

3y=-11+5

3y=-6

<u>y=-6/3=-2</u>

e)-5x-4(2x+1)=35       as y=2x+1

-5x-8x+4=35

3x+4=35

3x=35-4

3x=31

x=31/3

<u>x=10.3</u>

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