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Vinil7 [7]
3 years ago
9

How do you do this?? I don’t understand at all

Mathematics
2 answers:
AlladinOne [14]3 years ago
7 0

X=5 becuase if 7*3=21 then x*3=15 and 5 times 3 = 15



So the answer is 12

Rus_ich [418]3 years ago
4 0

so i believe that 21 shrinks down to 7 and then you find what multiplication can make 7 to 21 and the answer is 3 because of 7*3=21

then  you do the same to the other side which is 15 but instead you divide by 3 which gives you 5 so

x=5

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8_murik_8 [283]

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<em><u>Solution:</u></em>

Given that,

y = x + 3 ------- eqn 1\\\\y = x^2 + 2x - 4  ----- eqn 2

<em><u>We have to substitute eqn 1 in eqn 2</u></em>

x + 3 = x^2 + 2x - 4

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x = \frac{ -1 \pm 5.385 }{2}\\\\We\ have\ two\ solutions\\\\x = \frac{ -1 + 5.385 }{2}\\\\x = 2.1925

Also\\\\x = \frac{ -1 - 5.385 }{2}\\\\x = -3.1925

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y = 2.1925 + 3

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Substitute x = -3.1925 in eqn 1

y = -3.1925 + 3

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Step-by-step explanation:

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