Question

Solve using elimination.

–3x + 10y = –7
–3x + 4y = –19

Answer 1

Approximately 6.78

Explanation:

–3x + 10y = –7 - - - - - - > (1)

–3x + 4y = –19 - - - - - - > (2)

(1) - (2) Because if same sign then you have subtract to cancel out the equal numbers therefore - 3x and - 3x is cancelled out

6y = +2

y = 2 ÷ 6

y = 1/3

Then to find the value of x substitute value of y

-3x + (4 × 1/3) = - 19

-3x + 4/3 = - 19

- 3x = - 19 - 4/3

- 3x = - 61/3

x = ( - 61/3 ÷ -3)

x = 6.78