Solve the simultaneous equations
3x – y = 12
x +y = – 4
D =
y =
N

x+y=-4=y=-x-4

3x-(-x-4)=12

4x-4=12

4x=16

x=4

4+y=-4

y=-4

solution

(4,-4)

690th QUESTION LETS GOOO!!!

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x is 2 and y is -6

Step-by-step explanation:

3x-y=12

x+y=-4

Adding both equations to eliminate y

4x=8

x=2

Substituting

2+y=-4

y=-6

x is 2 and y is -6

Proving that this answer is correct:

Substituting x is 2 and y is -6

3*2-(-6)=12 6+6=12 12=12 True

2-6=-4 -4=-4 True

Therefore, x is 2 and y is -6

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.