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4 years ago

Solve for substitution 8x+2y=13 and 4x+y=11

1 answer:

7 0

Solving for X:
1) y=-8x+6.5 y=-4x+11
2) -8x+6.5=-4x+11
3) -8x=-4x+11-6.5 (Subtract 6.5 from both sides)
4) -8x+4x=11-6.5 (Add 4x to both sides)
5)-4x=4.5
5)x=-1.125

Solving for Y:
y=-8(-1.125)+6.5
y=9+6.5
y=15.5

y=-4(-1.125)+11
y=4.5+11
y=15.5

x=-1.125
y=15.5
or
(-1.125,15.5)

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2 years ago

3x - y = 2 y = 2x -9 what is x and y using substitution

xxTIMURxx [149]

3x - y = 2

y = 2x - 9

Substitute:

3x - 2x - 9 = 2

x - 9 = 2

x = 11

Substitute your answer into any equation:

y = 2x - 9

y = 2(11) - 9

y = 22 - 9

y = 13

Answer:

x = 11 ; y = 13

8 0

4 years ago

Read 2 more answers

Help me pleaseeeeeeeee

natka813 [3]

Answer:

20 m

Step-by-step explanation:

Here, we will take,

The distance from top of the building to the tip of the shadow = Hypotenuse = 37 m

The length of shadow of the building = base = 32 m

let, height of the building = perpendicular = p

According to the Pythagoras Theorem,

(Hypotenuse)² = (Base)² + (Perpendicular)²

h² = b² + p²

p² = h² - b²

p² = 37² - 32²

p² = 1369 - 1024

p² = 345

p = 18.57

and if we round the solution to nearest tenth it will be 20.

Hence, height of the building is 20 m.

7 0

3 years ago