Solving 2 Variable Equation (2)

Algebra Level 1

y = 7 x − 2 \large y=7x-2

Which of the ordered pairs is a solution of the following equation?

( A ) : ( x , y ) = ( 3 , 15 ) (A): (x,y)=(3,15) .

( B ) : ( x , y ) = ( − 1 , − 10 ) (B): (x,y)=(-1,-10) .

Neither (A) nor (B) (B) only Both (A) and (B) (A) only

Daehan Lee by Daehan Lee , 19, South Korea

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1 solution

Hung Woei Neoh
Jun 14, 2016

Substitute the value of x x into the equation

(A) : x = 3 , y = 7 ( 3 ) − 2 = 19 ≠ 15 x=3,\;y=7(3)-2=19 \neq 15

(B) : x = − 1 , y = 7 ( − 1 ) − 2 = − 9 ≠ − 10 x=-1,\;y=7(-1)-2= -9 \neq -10

From here, we can see that neither (A) nor (B) \boxed{\text{neither (A) nor (B)}} satisfy this equation

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